Polygnathidae

{{Short description|Extinct family of jawless fishes}}

{{taxobox

| image = Conodonts.jpg

| image_caption = {{hidden|10–11. Polygnathus sp.
(see caption)|10–14. Conodonts from the basal 20 cm of the Loyalhanna Limestone Member of the Mauch Chunk Formation, Keystone quarry, Pa. (93RS–79a), and Westernport, Md. (93RS–67). Note the highly abraded and reworked aeolian forms.
10. Polygnathus sp., Pa element, upper view, reworked Late Devonian to Early Mississippian morphotype, 93RS–79a, X140.
11. Polygnathus sp., Pa element, upper view, reworked Late Devonian to Early Mississippian morphotype, 93RS–67, X140.}}

| regnum = Animalia

| phylum = Chordata

| classis = †Conodonta

| ordo = †Ozarkodinida

| subordo = †Ozarkodinina

| superfamilia = †Polygnathacea

| familia = †Polygnathidae

| familia_authority = Bassler, 1925Classification and stratigraphic use of the conodonts. RS Bassler - Geological Society of America Bulletin, 1925

| subdivision_ranks = Genera

| subdivision =

• †Avignathus
• †Bispathodus
• †Ctenopolygnathus
• †Mehlina
• †Nicollidina
• †Pandorinellina
• †Parapolygnathus
• †Polygnathus Hinde, 1879 (type)
• †Streptognathodus
• †Synclydagnathus

}}

Polygnathidae is an extinct family of conodonts.