Sibiril (; ) is a commune in the Finistère department of Brittany in north-western France.
Sibiril has an oceanic climate (Köppen climate classification Cfb). The average annual temperature in Sibiril is . The average annual rainfall is with December as the wettest month. The temperatures are highest on average in August, at around , and lowest in January, at around . The highest temperature ever recorded in Sibiril was on 30 June 2015; the coldest temperature ever recorded was on 8 February 1991.
Inhabitants of Sibiril are called in French Sibirilois.