Marathonitidae

{{Short description|Extinct family of molluscs}}

{{Automatic taxobox

| fossil_range =

| image =

| image_caption =

| taxon = Marathonitidae

| authority = Ruzhencev 1938

| subdivision_ranks = Subfamilies

| subdivision =

• Jilingitinae
• Kargalitinae
• Kufengoceratinae
• Marathonitinae

}}

Marathonitidae is the only family in the Marathonitoidea superfamily. They are an extinct group of ammonoid, which are shelled cephalopods related to squids, belemnites, octopuses, and cuttlefish, and more distantly to the nautiloids.