diff --git a/swh/loader/svn/svn.py b/swh/loader/svn/svn.py
--- a/swh/loader/svn/svn.py
+++ b/swh/loader/svn/svn.py
@@ -43,7 +43,7 @@
 
 
 def quote_svn_url(url: str) -> str:
-    return url.replace(" ", "%20")
+    return url.replace(" ", "%20").replace("#", "%23")
 
 
 class SvnRepo:
diff --git a/swh/loader/svn/tests/test_loader.py b/swh/loader/svn/tests/test_loader.py
--- a/swh/loader/svn/tests/test_loader.py
+++ b/swh/loader/svn/tests/test_loader.py
@@ -2175,8 +2175,10 @@
     check_snapshot(loader.snapshot, loader.storage)
 
 
-def test_loader_with_spaces_in_svn_url(swh_storage, repo_url, tmp_path):
-    filename = "file with spaces.txt"
+@pytest.mark.parametrize(
+    "filename", ["file with spaces.txt", "file#with#hash#signs.txt"]
+)
+def test_loader_with_special_chars_in_svn_url(repo_url, tmp_path, filename):
     content = b"foo"
 
     add_commit(