diff --git a/spacy/displacy/__init__.py b/spacy/displacy/__init__.py
index ea6bba2c9..f42dad0c9 100644
--- a/spacy/displacy/__init__.py
+++ b/spacy/displacy/__init__.py
@@ -125,13 +125,17 @@ def app(environ, start_response):
     return [res]
 
 
-def parse_deps(orig_doc: Doc, options: Dict[str, Any] = {}) -> Dict[str, Any]:
+def parse_deps(
+    orig_doc: Union[Doc, Span], options: Dict[str, Any] = {}
+) -> Dict[str, Any]:
     """Generate dependency parse in {'words': [], 'arcs': []} format.
 
-    orig_doc (Doc): Document to parse.
+    orig_doc (Union[Doc, Span]): Document to parse.
     options (Dict[str, Any]): Dependency parse specific visualisation options.
     RETURNS (dict): Generated dependency parse keyed by words and arcs.
     """
+    if isinstance(orig_doc, Span):
+        orig_doc = orig_doc.as_doc()
     doc = Doc(orig_doc.vocab).from_bytes(
         orig_doc.to_bytes(exclude=["user_data", "user_hooks"])
     )
diff --git a/spacy/tests/test_displacy.py b/spacy/tests/test_displacy.py
index f298b38e0..837a92e02 100644
--- a/spacy/tests/test_displacy.py
+++ b/spacy/tests/test_displacy.py
@@ -275,6 +275,20 @@ def test_displacy_parse_deps(en_vocab):
         {"start": 2, "end": 3, "label": "det", "dir": "left"},
         {"start": 1, "end": 3, "label": "attr", "dir": "right"},
     ]
+    # Test that displacy.parse_deps converts Span to Doc
+    deps = displacy.parse_deps(doc[:])
+    assert isinstance(deps, dict)
+    assert deps["words"] == [
+        {"lemma": None, "text": words[0], "tag": pos[0]},
+        {"lemma": None, "text": words[1], "tag": pos[1]},
+        {"lemma": None, "text": words[2], "tag": pos[2]},
+        {"lemma": None, "text": words[3], "tag": pos[3]},
+    ]
+    assert deps["arcs"] == [
+        {"start": 0, "end": 1, "label": "nsubj", "dir": "left"},
+        {"start": 2, "end": 3, "label": "det", "dir": "left"},
+        {"start": 1, "end": 3, "label": "attr", "dir": "right"},
+    ]
 
 
 def test_displacy_invalid_arcs():
diff --git a/website/docs/api/top-level.mdx b/website/docs/api/top-level.mdx
index d0851a59f..9193b2a7b 100644
--- a/website/docs/api/top-level.mdx
+++ b/website/docs/api/top-level.mdx
@@ -291,7 +291,7 @@ the `manual=True` argument in `displacy.render`.
 
 | Name        | Description                                                         |
 | ----------- | ------------------------------------------------------------------- |
-| `orig_doc`  | Doc to parse dependencies. ~~Doc~~                                  |
+| `orig_doc`  | Doc or span to parse dependencies. ~~Union[Doc, Span]~~             |
 | `options`   | Dependency parse specific visualisation options. ~~Dict[str, Any]~~ |
 | **RETURNS** | Generated dependency parse keyed by words and arcs. ~~dict~~        |