A total of 77 adult and 123 juvenile willow grouse (Lagopus lagopus) from the island of Karlsöy, and 75 adult and 63 juvenile willow grouse from Sennaland on the mainland of North Norway were examined for helminths. Raillietina urogalli and Hymenolepis microps, and Ascaridia compar and Syngamus trachea were found. All four species occurred regularly in grouse from Karlsöy between April and September-October, but only H. microps was frequently found in birds from Sennaland. S. trachea only parasitised juvenile grouse.