diff --git a/_extensions/classref_admonitions.py b/_extensions/classref_admonitions.py
new file mode 100644
index 000000000..c9bc0dbae
--- /dev/null
+++ b/_extensions/classref_admonitions.py
@@ -0,0 +1,124 @@
+# -*- coding: utf-8 -*-
+"""
+    class_ref_admonitions
+    ~~~~~~~~~~~~~~~~~~~~~
+
+    Sphinx extension to format Godot's classref admonitions.
+
+    :copyright: Copyright 2026 by The Godot Engine Community
+    :license: MIT.
+"""
+
+import re
+from docutils import nodes
+from docutils.parsers.rst import Directive
+from sphinx.writers.html5 import HTML5Translator
+
+
+class classref_admonition(nodes.General, nodes.Element):
+    pass
+
+
+class classref_important(classref_admonition):
+    pass
+
+
+class classref_note(classref_admonition):
+    pass
+
+
+class classref_tip(classref_admonition):
+    pass
+
+
+class classref_warning(classref_admonition):
+    pass
+
+
+class BaseClassrefDirective(Directive):
+    has_content = True
+
+    title = ""
+    css_class = ""
+    node_class = classref_admonition
+
+    def run(self):
+        self.assert_has_content()
+
+        node = self.node_class()
+        node["title"] = self.title
+        node["classes"].append(self.css_class)
+
+        self.state.nested_parse(
+            self.content,
+            self.content_offset,
+            node,
+        )
+
+        return [node]
+
+
+class ClassrefNoteDirective(BaseClassrefDirective):
+    node_class = classref_note
+    title = "Note"
+    css_class = "note classref-admonition"
+
+
+class ClassrefWarningDirective(BaseClassrefDirective):
+    node_class = classref_warning
+    title = "Warning"
+    css_class = "warning classref-admonition"
+
+
+class ClassrefTipDirective(BaseClassrefDirective):
+    node_class = classref_tip
+    title = "Tip"
+    css_class = "tip classref-admonition"
+
+
+class ClassrefImportantDirective(BaseClassrefDirective):
+    node_class = classref_important
+    title = "Important"
+    css_class = "important classref-admonition"
+
+
+def visit_inline_html(self, node):
+    classes = " ".join(node["classes"])
+    self.body.append(f'<p class="{classes}">')
+    self.body.append(f'<span class="admonition-title">{node["title"]}:</span> ')
+
+
+def depart_inline_html(self, node):
+    self.body.append("</p>")
+
+
+def setup(app):
+    app.set_translator("html", ClassrefAdmonitionHTMLTranslator, override=True)
+    for node in (
+        classref_important,
+        classref_note,
+        classref_tip,
+        classref_warning,
+    ):
+        app.add_node(node, html=(visit_inline_html, depart_inline_html))
+    app.add_directive("classref_important", ClassrefImportantDirective)
+    app.add_directive("classref_note", ClassrefNoteDirective)
+    app.add_directive("classref_tip", ClassrefTipDirective)
+    app.add_directive("classref_warning", ClassrefWarningDirective)
+
+    return {
+        "parallel_read_safe": True,
+        "parallel_write_safe": True,
+    }
+
+
+class ClassrefAdmonitionHTMLTranslator(HTML5Translator):
+    def visit_paragraph(self, node):
+        if isinstance(node.parent, classref_admonition):
+            return
+        super().visit_paragraph(node)
+
+    def depart_paragraph(self, node):
+        if isinstance(node.parent, classref_admonition):
+            return
+        super().depart_paragraph(node)
diff --git a/_static/css/custom.css b/_static/css/custom.css
index 9e12f4386..d055c0005 100644
--- a/_static/css/custom.css
+++ b/_static/css/custom.css
@@ -164,18 +164,28 @@
     --admonition-note-color: #404040;
     --admonition-note-title-background-color: #6ab0de;
     --admonition-note-title-color: #fff;
+    --admonition-note-icon: url("data:image/svg+xml;base64,PHN2ZyB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciIHdpZHRoPSIxNiIgaGVpZ2h0PSIxNiI+PHBhdGggZmlsbD0iI2ZmZiIgZD0iTTggMWE3IDcgMCAwIDAgMCAxNEE3IDcgMCAwIDAgOCAxek03IDRoMnYySDd6bTAgM2gydjVIN3oiLz48L3N2Zz4=");
     --admonition-attention-background-color: #ffedcc;
     --admonition-attention-color: #404040;
     --admonition-attention-title-background-color: #f0b37e;
     --admonition-attention-title-color: #fff;
+    --admonition-attention-icon: url("data:image/svg+xml;base64,PHN2ZyB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciIHdpZHRoPSIxNiIgaGVpZ2h0PSIxNiI+PHBhdGggZmlsbD0iI2ZmZiIgZD0iTTggMWE3IDcgMCAwIDAgMCAxNEE3IDcgMCAwIDAgOCAxek03IDNoMnY3SDd6bTAgOGgydjJIN3oiLz48L3N2Zz4=");
     --admonition-danger-background-color: #fcf3f2;
     --admonition-danger-color: #404040;
     --admonition-danger-title-background-color: #e9a499;
     --admonition-danger-title-color: #fff;
+    --admonition-danger-icon: url("data:image/svg+xml;base64,PHN2ZyB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciIHdpZHRoPSIxNiIgaGVpZ2h0PSIxNiI+PHBhdGggZmlsbD0iI2ZmZiIgZD0iTTggMmExIDEgMCAwIDAtLjg1LjQ4NGwtNiAxMEExIDEgMCAwIDAgMiAxNGgxMmExIDEgMCAwIDAgLjg1Ny0xLjUxNGwtNi0xMGExIDEgMCAwIDAtLjg1LS40ODR6TTcgNWgydjVIN3ptMCA2aDJ2Mkg3eiIvPjwvc3ZnPg==");
     --admonition-tip-background-color: #dbfaf4;
     --admonition-tip-color: #404040;
     --admonition-tip-title-background-color: #1abc9c;
     --admonition-tip-title-color: #fff;
+    --admonition-tip-icon: url("data:image/svg+xml;base64,PHN2ZyB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciIHdpZHRoPSIxNiIgaGVpZ2h0PSIxNiI+PHBhdGggZmlsbD0iI2ZmZiIgZD0iTTggMWE3IDcgMCAxIDAgMCAxNEE3IDcgMCAwIDAgOCAxem0zLjI5MyAzLjg3NyAxLjQxNCAxLjQxNEw3IDEyLjAwMSAzLjI5MyA4LjI5bDEuNDE0LTEuNDE0TDcgOS4xN3oiLz48L3N2Zz4=");
+
+    --classref-admonition-note-color: color-mix(in oklch, var(--admonition-note-color) 50%, var(--admonition-note-title-background-color));
+    --classref-admonition-warning-color: color-mix(in oklch, var(--admonition-attention-color) 50%, var(--admonition-attention-title-background-color));
+    --classref-admonition-tip-color: color-mix(in oklch, var(--admonition-tip-color) 50%, var(--admonition-tip-title-background-color));
+    --classref-admonition-important-color: color-mix(in oklch, var(--admonition-danger-color) 50%, var(--admonition-danger-title-background-color));
+    --classref-admonition-saturation: 300%;
 
     --kbd-background-color: #fafbfc;
     --kbd-outline-color: #d1d5da;
@@ -319,6 +329,8 @@
         --admonition-tip-title-background-color: #336648;
         --admonition-tip-title-color: #dfd;
 
+        --classref-admonition-saturation: 200%;
+
         --kbd-background-color: #595b5d;
         --kbd-outline-color: #3d4144;
         --kbd-shadow-color: #1e2023;
@@ -1244,6 +1256,75 @@ code,
     color: var(--admonition-tip-title-color);
 }
 
+.rst-content .classref-admonition .admonition-title {
+    background-color: transparent;
+    display: inline;
+}
+.rst-content .classref-admonition .admonition-title::before {
+    content: "";
+    height: 1rem;
+    top: 0.1rem;
+    position: relative;
+    width: 1rem;
+}
+
+.rst-content .classref-admonition.note .admonition-title {
+    color: var(--classref-admonition-note-color);
+}
+.rst-content .classref-admonition.note .admonition-title::before {
+    mask-image: var(--admonition-note-icon);
+    background-color: var(--classref-admonition-note-color);
+}
+
+.rst-content .classref-admonition.warning .admonition-title {
+    color: var(--classref-admonition-warning-color);
+}
+.rst-content .classref-admonition.warning .admonition-title::before {
+    mask-image: var(--admonition-danger-icon);
+    background-color: var(--classref-admonition-warning-color);
+}
+
+.rst-content .classref-admonition.tip .admonition-title {
+    color: var(--classref-admonition-tip-color);
+}
+.rst-content .classref-admonition.tip .admonition-title::before {
+    mask-image: var(--admonition-tip-icon);
+    background-color: var(--classref-admonition-tip-color);
+}
+
+.rst-content .classref-admonition.important .admonition-title {
+    color: var(--classref-admonition-important-color);
+}
+.rst-content .classref-admonition.important .admonition-title::before {
+    mask-image: var(--admonition-attention-icon);
+    background-color: var(--classref-admonition-important-color);
+}
+
+.rst-content .classref-admonition {
+    padding: 0px;
+    padding-left: 12px;
+    margin-bottom: 12px;
+    background-color: transparent;
+    border-left: 0.2rem solid;
+    filter: saturate(var(--classref-admonition-saturation));
+}
+
+.rst-content .classref-admonition.note {
+    border-left-color: var(--classref-admonition-note-color);
+}
+
+.rst-content .classref-admonition.warning {
+    border-left-color: var(--classref-admonition-warning-color);
+}
+
+.rst-content .classref-admonition.tip {
+    border-left-color: var(--classref-admonition-tip-color);
+}
+
+.rst-content .classref-admonition.important {
+    border-left-color: var(--classref-admonition-important-color);
+}
+
 .article-status strong {
     color: var(--body-color);
 }
diff --git a/conf.py b/conf.py
index f64d4cb70..fef107e12 100644
--- a/conf.py
+++ b/conf.py
@@ -20,6 +20,7 @@ extensions = [
     "sphinx_copybutton",
     "sphinxcontrib.video",
     "gdscript",
+    "classref_admonitions",
 ]
 
 # Warning when the Sphinx Tabs extension is used with unknown