diff --git a/docs/guide.rst b/docs/guide.rst
index e457e2a..2456af0 100644
--- a/docs/guide.rst
+++ b/docs/guide.rst
@@ -92,6 +92,22 @@ There is ``stlite`` directive to write Stlite app code into document.
 
       This supports multiline strings, comma-separated strings, or combinations.
 
+   .. rst:directive:option:: height
+
+      Height of the stlite iframe.
+
+      Accepts values with units (e.g., ``500px``, ``30rem``) or numeric values (treated as pixels).
+
+      Example:
+
+      .. code-block:: rst
+
+         .. stlite::
+            :height: 600px
+
+            import streamlit as st
+            st.title("Custom Height Example")
+
 Configuration
 =============
 
diff --git a/src/atsphinx/stlite/directives.py b/src/atsphinx/stlite/directives.py
index 24611a4..e56f82e 100644
--- a/src/atsphinx/stlite/directives.py
+++ b/src/atsphinx/stlite/directives.py
@@ -46,10 +46,12 @@ class StliteDirective(SphinxDirective):  # noqa: D101
     option_spec = {
         "config": parsed_dict,
         "requirements": list_of_str,
+        "height": str,
     }
     DEFAULT_OPTIONS = {
         "config": None,
         "requirements": [],
+        "height": None,
     }
 
     def run(self):  # noqa: D102
diff --git a/src/atsphinx/stlite/nodes.py b/src/atsphinx/stlite/nodes.py
index de2a471..731c9e9 100644
--- a/src/atsphinx/stlite/nodes.py
+++ b/src/atsphinx/stlite/nodes.py
@@ -27,8 +27,18 @@ class stlite(nodes.Element, nodes.General):  # noqa: D101
 def visit_stlite(self: HTML5Translator, node: stlite) -> None:  # noqa: D103
     config = self.builder.config
     srcdoc = escape(srcdoc_template.render(app=node.attributes, config=config))
+    
+    # Apply custom height if specified
+    style_attr = ""
+    if node.attributes.get("height"):
+        height = node.attributes["height"]
+        # Ensure px suffix if numeric value without unit
+        if height.isdigit():
+            height = f"{height}px"
+        style_attr = f' style="height: {escape(height)};"'
+    
     self.body.append(
-        f'<div class="stlite-wrapper"><iframe class="stlite-frame" srcdoc="{srcdoc}">'
+        f'<div class="stlite-wrapper"><iframe class="stlite-frame"{style_attr} srcdoc="{srcdoc}">'
     )
 
 
diff --git a/tests/test_directives.py b/tests/test_directives.py
index 7c77d16..f0d3d85 100644
--- a/tests/test_directives.py
+++ b/tests/test_directives.py
@@ -100,3 +100,47 @@ def test__parse_requirements(app: SphinxTestApp, source: str):
     doctree = restructuredtext.parse(app, dedent(source).strip())
     node = pick_first_stlite(doctree)
     assert node["requirements"] == ["matplotlib", "polars"]
+
+
+@pytest.mark.sphinx(confoverrides={"extensions": ["atsphinx.stlite"]})
+@pytest.mark.parametrize(
+    ["source", "expected"],
+    [
+        pytest.param(
+            """
+    .. stlite::
+       :height: 500px
+
+       print("Hello world")
+    """,
+            "500px",
+            id="with-unit",
+        ),
+        pytest.param(
+            """
+    .. stlite::
+       :height: 30rem
+
+       print("Hello world")
+    """,
+            "30rem",
+            id="rem-unit",
+        ),
+        pytest.param(
+            """
+    .. stlite::
+       :height: 600
+
+       print("Hello world")
+    """,
+            "600",
+            id="numeric-only",
+        ),
+    ],
+)
+def test__parse_height(app: SphinxTestApp, source: str, expected: str):
+    """Test height option parsing."""
+    doctree = restructuredtext.parse(app, dedent(source).strip())
+    node = pick_first_stlite(doctree)
+    assert node["height"] == expected
+