Isarn may refer to:
Isarn, Count of Pallars (died 948) Isarn (bishop of Grenoble) (died 976) Isarn (troubadours), the name of three mid-13th century troubadours Isarn (inquisitor) (), French Dominican missionary, inquisitor and writer William Isarn (died 1010s), Count of Ribagorza
See also Isard (disambiguation)