diff --git a/flexmark-ext-docusaurus-admonition/pom.xml b/flexmark-ext-docusaurus-admonition/pom.xml
new file mode 100644
index 000000000..9bf2130bd
--- /dev/null
+++ b/flexmark-ext-docusaurus-admonition/pom.xml
@@ -0,0 +1,41 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+    <modelVersion>4.0.0</modelVersion>
+
+    <parent>
+        <groupId>com.vladsch.flexmark</groupId>
+        <artifactId>flexmark-java</artifactId>
+        <version>0.64.8</version>
+    </parent>
+
+    <artifactId>flexmark-ext-docusaurus-admonition</artifactId>
+    <name>flexmark-java extension for Docusaurus admonition syntax</name>
+    <description>flexmark-java extension for docusaurus admonition syntax</description>
+
+    <dependencies>
+        <dependency>
+            <groupId>com.vladsch.flexmark</groupId>
+            <artifactId>flexmark-util</artifactId>
+        </dependency>
+        <dependency>
+            <groupId>com.vladsch.flexmark</groupId>
+            <artifactId>flexmark</artifactId>
+        </dependency>
+        <dependency>
+            <groupId>com.vladsch.flexmark</groupId>
+            <artifactId>flexmark-test-util</artifactId>
+            <scope>test</scope>
+        </dependency>
+        <dependency>
+            <groupId>com.vladsch.flexmark</groupId>
+            <artifactId>flexmark-ext-tables</artifactId>
+            <scope>test</scope>
+        </dependency>
+        <dependency>
+            <groupId>com.vladsch.flexmark</groupId>
+            <artifactId>flexmark-core-test</artifactId>
+            <scope>test</scope>
+        </dependency>
+    </dependencies>
+
+</project>
\ No newline at end of file
diff --git a/flexmark-ext-docusaurus-admonition/src/main/java/com/vladsch/flexmark/ext/docusaurus/admonition/DocusaurusAdmonitionBlock.java b/flexmark-ext-docusaurus-admonition/src/main/java/com/vladsch/flexmark/ext/docusaurus/admonition/DocusaurusAdmonitionBlock.java
new file mode 100644
index 000000000..f8f9725a1
--- /dev/null
+++ b/flexmark-ext-docusaurus-admonition/src/main/java/com/vladsch/flexmark/ext/docusaurus/admonition/DocusaurusAdmonitionBlock.java
@@ -0,0 +1,48 @@
+package com.vladsch.flexmark.ext.docusaurus.admonition;
+
+import com.vladsch.flexmark.util.ast.Block;
+import com.vladsch.flexmark.util.ast.BlockContent;
+import com.vladsch.flexmark.util.sequence.BasedSequence;
+
+class DocusaurusAdmonitionBlock extends Block {
+    private BasedSequence openingMarker = BasedSequence.NULL;
+    private BasedSequence type = BasedSequence.NULL;
+    private BasedSequence closingMarker = BasedSequence.NULL;
+    private final BlockContent content = new BlockContent();
+
+    public DocusaurusAdmonitionBlock() {
+    }
+
+    @Override
+    public BasedSequence[] getSegments() {
+        return new BasedSequence[]{openingMarker, type, closingMarker};
+    }
+
+    public BasedSequence getOpeningMarker() {
+        return this.openingMarker;
+    }
+
+    public BasedSequence getType() {
+        return this.type;
+    }
+
+    public BasedSequence getClosingMarker() {
+        return this.closingMarker;
+    }
+
+    public BlockContent getContent() {
+        return this.content;
+    }
+
+    public void setOpeningMarker(BasedSequence openingMarker) {
+        this.openingMarker = openingMarker;
+    }
+
+    public void setType(BasedSequence type) {
+        this.type = type;
+    }
+
+    public void setClosingMarker(BasedSequence closingMarker) {
+        this.closingMarker = closingMarker;
+    }
+}
diff --git a/flexmark-ext-docusaurus-admonition/src/main/java/com/vladsch/flexmark/ext/docusaurus/admonition/DocusaurusAdmonitionBlockParser.java b/flexmark-ext-docusaurus-admonition/src/main/java/com/vladsch/flexmark/ext/docusaurus/admonition/DocusaurusAdmonitionBlockParser.java
new file mode 100644
index 000000000..b71a6ef9d
--- /dev/null
+++ b/flexmark-ext-docusaurus-admonition/src/main/java/com/vladsch/flexmark/ext/docusaurus/admonition/DocusaurusAdmonitionBlockParser.java
@@ -0,0 +1,118 @@
+package com.vladsch.flexmark.ext.docusaurus.admonition;
+
+import com.vladsch.flexmark.parser.block.*;
+import com.vladsch.flexmark.util.ast.Block;
+import com.vladsch.flexmark.util.ast.BlockContent;
+import com.vladsch.flexmark.util.data.DataHolder;
+import com.vladsch.flexmark.util.sequence.BasedSequence;
+import org.jetbrains.annotations.NotNull;
+
+import java.util.Set;
+
+class DocusaurusAdmonitionBlockParser extends AbstractBlockParser {
+    private final DocusaurusAdmonitionBlock block = new DocusaurusAdmonitionBlock();
+    private BlockContent content = new BlockContent();
+    private boolean hadClose = false;
+
+    private final String closingLine;
+
+    public DocusaurusAdmonitionBlockParser(BasedSequence openingMarker, BasedSequence type, int nestingLevel) {
+        block.setOpeningMarker(openingMarker);
+        block.setType(type);
+        closingLine = ":".repeat(nestingLevel);
+    }
+
+    @Override
+    public Block getBlock() {
+        return block;
+    }
+
+    @Override
+    public BlockContinue tryContinue(ParserState state) {
+
+        if (hadClose) {
+            return BlockContinue.none();
+        }
+
+        BasedSequence line = state.getLine();
+
+        boolean isClosingLine = line.matches(closingLine);
+
+        if (isClosingLine) {
+            block.setClosingMarker(line);
+            hadClose = true;
+            return BlockContinue.atIndex(state.getLineEndIndex());
+        }
+
+        return BlockContinue.atIndex(state.getIndex());
+    }
+
+    @Override
+    public boolean isContainer() {
+        return true; // can contain other blocks
+    }
+
+    @Override
+    public boolean canContain(ParserState state, BlockParser blockParser, Block block) {
+        return true; // can contain anything
+    }
+
+    @Override
+    public void addLine(ParserState state, BasedSequence line) {
+        content.add(line, state.getIndent());
+
+    }
+
+    @Override
+    public void closeBlock(ParserState state) {
+        block.setContent(content);
+        block.setCharsFromContent();
+
+        content = null;
+    }
+
+    public static class Factory implements CustomBlockParserFactory {
+        @Override
+        public @NotNull BlockParserFactory apply(@NotNull DataHolder options) {
+            return new BlockFactory(options);
+        }
+
+        @Override
+        public Set<Class<?>> getAfterDependents() {
+            return null;
+        }
+
+        @Override
+        public Set<Class<?>> getBeforeDependents() {
+            return null;
+        }
+
+        @Override
+        public boolean affectsGlobalScope() {
+            return false;
+        }
+    }
+
+    private static class BlockFactory extends AbstractBlockParserFactory {
+        BlockFactory(DataHolder options) {
+            super(options);
+        }
+
+        @Override
+        public BlockStart tryStart(ParserState state, MatchedBlockParser matchedBlockParser) {
+            BasedSequence line = state.getLine();
+            if (line.startsWith(":::")) {
+                int colons = 0;
+                while (colons < line.length() && line.charAt(colons) == ':') {
+                    colons++;
+                }
+                BasedSequence type = line.subSequence(colons).trim();
+                if (!type.isEmpty() && !type.toString().contains(" ")) {
+                    return BlockStart.of(new DocusaurusAdmonitionBlockParser(line.subSequence(0, colons), type, colons))
+                            .atIndex(line.length());
+                }
+            }
+            return BlockStart.none();
+        }
+    }
+}
diff --git a/flexmark-ext-docusaurus-admonition/src/main/java/com/vladsch/flexmark/ext/docusaurus/admonition/DocusaurusAdmonitionExtension.java b/flexmark-ext-docusaurus-admonition/src/main/java/com/vladsch/flexmark/ext/docusaurus/admonition/DocusaurusAdmonitionExtension.java
new file mode 100644
index 000000000..fccab493d
--- /dev/null
+++ b/flexmark-ext-docusaurus-admonition/src/main/java/com/vladsch/flexmark/ext/docusaurus/admonition/DocusaurusAdmonitionExtension.java
@@ -0,0 +1,33 @@
+package com.vladsch.flexmark.ext.docusaurus.admonition;
+
+import com.vladsch.flexmark.html.HtmlRenderer;
+import com.vladsch.flexmark.parser.Parser;
+import com.vladsch.flexmark.util.data.MutableDataHolder;
+import org.jetbrains.annotations.NotNull;
+
+public class DocusaurusAdmonitionExtension implements Parser.ParserExtension, HtmlRenderer.HtmlRendererExtension {
+
+    public static DocusaurusAdmonitionExtension create() {
+        return new DocusaurusAdmonitionExtension();
+    }
+
+    @Override
+    public void extend(Parser.Builder parserBuilder) {
+        parserBuilder.customBlockParserFactory(new DocusaurusAdmonitionBlockParser.Factory());
+    }
+
+    @Override
+    public void extend(HtmlRenderer.@NotNull Builder rendererBuilder, String rendererType) {
+        if (rendererType.equals("HTML")) {
+            rendererBuilder.nodeRendererFactory(new DocusaurusAdmonitionNodeRenderer.Factory());
+        }
+    }
+
+    @Override
+    public void rendererOptions(@NotNull MutableDataHolder options) {
+    }
+
+    @Override
+    public void parserOptions(MutableDataHolder options) {
+    }
+}
diff --git a/flexmark-ext-docusaurus-admonition/src/main/java/com/vladsch/flexmark/ext/docusaurus/admonition/DocusaurusAdmonitionNodeRenderer.java b/flexmark-ext-docusaurus-admonition/src/main/java/com/vladsch/flexmark/ext/docusaurus/admonition/DocusaurusAdmonitionNodeRenderer.java
new file mode 100644
index 000000000..3a767e5c7
--- /dev/null
+++ b/flexmark-ext-docusaurus-admonition/src/main/java/com/vladsch/flexmark/ext/docusaurus/admonition/DocusaurusAdmonitionNodeRenderer.java
@@ -0,0 +1,41 @@
+package com.vladsch.flexmark.ext.docusaurus.admonition;
+
+import com.vladsch.flexmark.html.HtmlWriter;
+import com.vladsch.flexmark.html.renderer.NodeRenderer;
+import com.vladsch.flexmark.html.renderer.NodeRendererContext;
+import com.vladsch.flexmark.html.renderer.NodeRendererFactory;
+import com.vladsch.flexmark.html.renderer.NodeRenderingHandler;
+import com.vladsch.flexmark.util.data.DataHolder;
+import org.jetbrains.annotations.NotNull;
+
+import java.util.HashSet;
+import java.util.Set;
+
+class DocusaurusAdmonitionNodeRenderer implements NodeRenderer {
+
+    @Override
+    public Set<NodeRenderingHandler<?>> getNodeRenderingHandlers() {
+        Set<NodeRenderingHandler<?>> set = new HashSet<>();
+        set.add(new NodeRenderingHandler<>(DocusaurusAdmonitionBlock.class, this::render));
+        return set;
+    }
+
+    private void render(DocusaurusAdmonitionBlock node, NodeRendererContext context, HtmlWriter html) {
+
+        String type = node.getType().toString();
+
+        html.attr("class", "docusaurus-admonition docusaurus-admonition-" + type);
+        html.withAttr().tag("div");
+
+        context.renderChildren(node);
+
+        html.tag("/div");
+    }
+
+    public static class Factory implements NodeRendererFactory {
+        @Override
+        public @NotNull NodeRenderer apply(@NotNull DataHolder options) {
+            return new DocusaurusAdmonitionNodeRenderer();
+        }
+    }
+}
diff --git a/flexmark-ext-docusaurus-admonition/src/main/javadoc/overview.md b/flexmark-ext-docusaurus-admonition/src/main/javadoc/overview.md
new file mode 100644
index 000000000..a9c509b22
--- /dev/null
+++ b/flexmark-ext-docusaurus-admonition/src/main/javadoc/overview.md
@@ -0,0 +1,35 @@
+# flexmark-ext-docusaurus-admonition
+
+Extension for [Docusaurus Admonitions](https://docusaurus.io/docs/markdown-features/admonitions).
+
+This extension renders Docusaurus admonitions into following HTML:
+
+```html
+<div class="docusaurus-admonition docusaurus-admonition-type">
+    <!-- any legal markdown here -->
+</div>
+```
+
+Please note that `-type` in class name is replaced with actual type of the admonition eg. `note`, `tip` etc.
+
+Nested admonitions are supported.
+
+Custom admonitions are supported by replacing `-type` in class with custom adminition type. It means that the following Markdown:
+
+```md
+
+:::my-custom-admonition
+Text here.
+:::
+
+```
+
+Will be rendered as:
+
+```html
+<div class="docusaurus-admonition docusaurus-admonition-my-custom-admonition">
+    <p>Text here.</p>
+</div>
+```
+
+Admonitions' titles are not supported now.
diff --git a/flexmark-ext-docusaurus-admonition/src/test/java/com/vladsch/flexmark/ext/docusaurus/admonition/DocusaurusAdmonitionBlockHtmlRendererTest.java b/flexmark-ext-docusaurus-admonition/src/test/java/com/vladsch/flexmark/ext/docusaurus/admonition/DocusaurusAdmonitionBlockHtmlRendererTest.java
new file mode 100644
index 000000000..cefa3602b
--- /dev/null
+++ b/flexmark-ext-docusaurus-admonition/src/test/java/com/vladsch/flexmark/ext/docusaurus/admonition/DocusaurusAdmonitionBlockHtmlRendererTest.java
@@ -0,0 +1,19 @@
+package com.vladsch.flexmark.ext.docusaurus.admonition;
+
+import com.vladsch.flexmark.parser.Parser;
+import com.vladsch.flexmark.util.ast.Document;
+import org.junit.Assert;
+import org.junit.Test;
+
+import java.util.Collections;
+
+public class DocusaurusAdmonitionBlockHtmlRendererTest {
+
+    @Test
+    public void checkParsing() {
+        Parser parser = Parser.builder().extensions(Collections.singleton(DocusaurusAdmonitionExtension.create())).build();
+
+        Document document = parser.parse(":::info\nThis is info\n:::");
+        Assert.assertTrue(document.getFirstChild() instanceof DocusaurusAdmonitionBlock);
+    }
+}
diff --git a/flexmark-ext-docusaurus-admonition/src/test/java/com/vladsch/flexmark/ext/docusaurus/admonition/DocusaurusAdmonitionBlockParserTest.java b/flexmark-ext-docusaurus-admonition/src/test/java/com/vladsch/flexmark/ext/docusaurus/admonition/DocusaurusAdmonitionBlockParserTest.java
new file mode 100644
index 000000000..5e8e3d6c9
--- /dev/null
+++ b/flexmark-ext-docusaurus-admonition/src/test/java/com/vladsch/flexmark/ext/docusaurus/admonition/DocusaurusAdmonitionBlockParserTest.java
@@ -0,0 +1,32 @@
+package com.vladsch.flexmark.ext.docusaurus.admonition;
+
+import com.vladsch.flexmark.html.HtmlRenderer;
+import com.vladsch.flexmark.parser.Parser;
+import com.vladsch.flexmark.util.data.MutableDataSet;
+import org.junit.Assert;
+import org.junit.Test;
+
+import java.util.List;
+
+public class DocusaurusAdmonitionBlockParserTest {
+
+    @Test
+    public void checkParsing() {
+        MutableDataSet options = new MutableDataSet();
+        options.set(Parser.EXTENSIONS, List.of(
+                DocusaurusAdmonitionExtension.create()
+        ));
+
+        Parser parser = Parser.builder(options).build();
+        HtmlRenderer renderer = HtmlRenderer.builder(options).build();
+
+        String markdownInput = ":::info\nThis is info\n:::";
+
+        // Act
+        String result = renderer.render(parser.parse(markdownInput));
+
+        // Assert
+        String expectedHtml = "<div class=\"docusaurus-admonition docusaurus-admonition-info\">\n<p>This is info</p>\n</div>\n";
+        Assert.assertEquals(expectedHtml, result);
+    }
+}
diff --git a/pom.xml b/pom.xml
index 3a2a62832..8e318d91a 100644
--- a/pom.xml
+++ b/pom.xml
@@ -26,6 +26,7 @@
         <module>flexmark-core-test</module>
         <module>flexmark-ext-abbreviation</module>
         <module>flexmark-ext-admonition</module>
+        <module>flexmark-ext-docusaurus-admonition</module>
         <module>flexmark-ext-anchorlink</module>
         <module>flexmark-ext-aside</module>
         <module>flexmark-ext-attributes</module>