Petar Delyan (reigned 1040–1041) is the leader of the local Bulgarian uprising against the Byzantine rule, started in the Theme of Bulgaria during the summer of 1040.

He is proclaimed Tsar of Bulgaria, as Samuels grandson, in Belgrade.

His original name may have been simply Delyan, in which case he assumes the name Petar II upon his accession, commemorating the sainted Emperor Petar I (Petăr I), who had died in 970.

The year of his birth is uncertain, but probably not long after 1000, and before 1014; he probably died in 1041.