diff --git a/ChangeLog.md b/ChangeLog.md
index fe9ec19..6fa6e6b 100644
--- a/ChangeLog.md
+++ b/ChangeLog.md
@@ -1,5 +1,12 @@
 # Gemtext ChangeLog
 
+## Unreleased
+
+**Released: WiP**
+
+- Added optional (on my default) support for Spartan input style lines
+  (`=:`). ([#6](https://github.com/davep/gemtext/pull/6))
+
 ## v1.0.0
 
 **Released: 2026-07-16**
diff --git a/src/gemtext/__init__.py b/src/gemtext/__init__.py
index c66e67a..f73a2bc 100644
--- a/src/gemtext/__init__.py
+++ b/src/gemtext/__init__.py
@@ -25,6 +25,7 @@
     Paragraph,
     PreFormatted,
     Quote,
+    SpartanPrompt,
 )
 
 ##############################################################################
@@ -38,6 +39,7 @@
     "Paragraph",
     "PreFormatted",
     "Quote",
+    "SpartanPrompt",
 ]
 
 ### __init__.py ends here
diff --git a/src/gemtext/parser.py b/src/gemtext/parser.py
index 2995107..111aa35 100644
--- a/src/gemtext/parser.py
+++ b/src/gemtext/parser.py
@@ -127,6 +127,20 @@ def _repr_props(self) -> tuple[str, ...]:
         return super()._repr_props() + (f"uri={self._uri!r}",)
 
 
+##############################################################################
+class SpartanPrompt(Link):
+    """A Spartan protocol link that prompts for input.
+
+    Note:
+        This is a subclass of [`Link`][gemtext.Link], as it behaves similarly to a
+        link in Gemtext.
+
+        This class will only ever be created if the Gemtext parser is
+        initialized with [`with_spartan_support=True`][gemtext.Gemtext].
+        Otherwise, Spartan prompts will be treated as regular paragraphs.
+    """
+
+
 ##############################################################################
 _LINK: Final[str] = "=>"
 """Marker for a link in Gemtext."""
@@ -144,20 +158,25 @@ def _repr_props(self) -> tuple[str, ...]:
 """Marker for a list item in Gemtext."""
 _NON_CONFORMING_LIST_ITEM: Final[str] = "*\t"
 """Marker for a non-conforming list item in Gemtext."""
+_SPARTAN_PROMPT: Final[str] = "=:"
+"""Marker for a Spartan protocol prompt in Gemtext."""
 
 
 ##############################################################################
 class Gemtext:
     """A Gemtext parser."""
 
-    def __init__(self, text: str) -> None:
+    def __init__(self, text: str, *, with_spartan_support: bool = True) -> None:
         """Initialize the GemText parser.
 
         Args:
             text: The Gemtext content to parse.
+            with_spartan_support: Whether to support [Spartan protocol prompts][gemtext.SpartanPrompt].
         """
         self._text = text
         """The raw Gemtext content to be parsed."""
+        self._with_spartan_support = with_spartan_support
+        """Whether to support Spartan protocol prompts."""
 
     def _parse(self) -> Iterator[Line]:
         """Parse the Gemtext content into Line objects.
@@ -194,6 +213,9 @@ def _parse(self) -> Iterator[Line]:
                 yield ListItem(line.removeprefix(_LIST_ITEM).strip())
             elif is_a(_NON_CONFORMING_LIST_ITEM):
                 yield ListItem(line.removeprefix(_NON_CONFORMING_LIST_ITEM).strip())
+            elif is_a(_SPARTAN_PROMPT) and self._with_spartan_support:
+                parts = line.removeprefix(_SPARTAN_PROMPT).strip().split(maxsplit=1)
+                yield SpartanPrompt(parts[0], parts[1] if len(parts) > 1 else "")
             else:
                 yield Paragraph(line)
         if in_preformat:
diff --git a/tests/test_spartan.py b/tests/test_spartan.py
new file mode 100644
index 0000000..346e581
--- /dev/null
+++ b/tests/test_spartan.py
@@ -0,0 +1,25 @@
+"""Unit tests for the Spartan extensions."""
+
+##############################################################################
+# Local imports.
+from gemtext import Gemtext, Link, Paragraph, SpartanPrompt
+
+
+##############################################################################
+def test_without_spartan_is_paragraph() -> None:
+    """Test that a Spartan link is treated as a paragraph when Spartan support is disabled."""
+    gemtext = Gemtext("=: spartan://spartan.example.com", with_spartan_support=False)
+    assert isinstance(gemtext.content[0], Paragraph)
+    assert str(gemtext.content[0]) == "=: spartan://spartan.example.com"
+
+
+##############################################################################
+def test_with_spartan_is_spartan_prompt() -> None:
+    """Test that a Spartan link is treated as a SpartanPrompt when Spartan support is enabled."""
+    gemtext = Gemtext("=: spartan://spartan.example.com")
+    assert isinstance(gemtext.content[0], SpartanPrompt)
+    assert isinstance(gemtext.content[0], Link)
+    assert gemtext.content[0].uri == "spartan://spartan.example.com"
+
+
+### test_spartan.py ends here