Cape Kolka (Livonian: Kūolka nanā, Latvian: Kolkasrags, Old High German: Domesnes) is a cape on the Baltic Sea, near the entry to Gulf of Riga, on the Livonian coast, in the Courland Peninsula of Latvia.

The cape is surrounded by the Irbe Strait (Irbes šaurums) which serves as the natural border with Estonia.

Cape Kolka represents the north-western limit of the Gulf of Riga.

East of the cape is the island of Ruhnu (Estonia) that lies in the middle of the Gulf.

There is a line of picturesque old Livonian settlements along the Baltic Sea shore, including Vaide, Saunags, Pitrags, Košrags and Sīkrags, all included into the culturally protected territory "Livonian Coast".