diff --git a/backend/app/services/csv_parser.py b/backend/app/services/csv_parser.py
index a121a76..06fbb42 100644
--- a/backend/app/services/csv_parser.py
+++ b/backend/app/services/csv_parser.py
@@ -76,7 +76,16 @@ def parse_csv(content: bytes, filename: str = "") -> list[ParsedCase]:
         and logged.
     """
     text = content.decode("utf-8-sig")  # Handle BOM
-    reader = csv.DictReader(io.StringIO(text))
+
+    # Auto-detect delimiter (comma vs semicolon) from first few lines
+    try:
+        dialect = csv.Sniffer().sniff(text[:2048], delimiters=",;\t")
+        delimiter = dialect.delimiter
+    except csv.Error:
+        delimiter = ","
+    logger.debug("CSV delimiter detected as %r for %s", delimiter, filename)
+
+    reader = csv.DictReader(io.StringIO(text), delimiter=delimiter)
     cases: list[ParsedCase] = []
     errors: list[str] = []
     skipped = 0