Israel's military says Iranian forces based in neighbouring Syria fired about 20 projectiles at Israeli positions in the occupied Golan Heights.
It says Israeli defence systems intercepted "some" of the incoming rockets and damage on the Israeli side was minimal. There were no Israeli casualties.
Iran has vowed revenge after blaming Israel for a series of deadly airstrikes on Iranian positions in Syria.
Pro-Syrian government media and activists reported earlier that missiles had been fired toward Israel from southern Syria targeting Israeli positions in the Golan Heights.
Lieutenant-Colonel Jonathan Conricus says Israel views the incident "with severity" and has responded.