diff --git a/myst_parser/parsers/directives.py b/myst_parser/parsers/directives.py
index d2512831..4f4f7ae3 100644
--- a/myst_parser/parsers/directives.py
+++ b/myst_parser/parsers/directives.py
@@ -192,7 +192,10 @@ def _parse_directive_options(
         content_lines = content.splitlines()
         yaml_lines = []
         while content_lines:
-            if not content_lines[0].lstrip().startswith(":"):
+            stripped = content_lines[0].lstrip()
+            # Stop at lines that don't start with a colon or have 3+ colons, which are colon fences
+            # (e.g. nested directives like `::::{other}`)
+            if not stripped.startswith(":") or stripped.startswith(":::"):
                 break
             yaml_lines.append(content_lines.pop(0).lstrip()[1:])
         options_block = "\n".join(yaml_lines)
diff --git a/tests/test_renderers/test_parse_directives.py b/tests/test_renderers/test_parse_directives.py
index 3813cc97..36eba61b 100644
--- a/tests/test_renderers/test_parse_directives.py
+++ b/tests/test_renderers/test_parse_directives.py
@@ -120,3 +120,10 @@ def test_additional_options():
     )
     assert len(result.warnings) == 1
     assert "Unknown option" in result.warnings[0].msg
+
+
+def test_colon_options_stop_at_colon_fence():
+    """Options parsing should stop when encountering a colon fence (3+ colons)."""
+    result = parse_directive_text(Note, "", ":class: xxx\n::::{other}\ncontent\n::::")
+    assert result.options == {"class": ["xxx"]}
+    assert result.body == ["::::{other}", "content", "::::"]