Clontarf (Irish: Cluain Tarbh, meaning “meadow of the bull”) is a suburb of northern Sydney, in the state of New South Wales, Australia. Clontarf is located 13 kilometres north-east of the Sydney central business district in the local government area of Northern Beaches Council, in the Northern Beaches region.

According to the 2016 census, there were 1,737 residents in Clontarf. Sixty-three per cent of people were born in Australia. The next most common country of birth was England at 11.9%. Eighty-one per cent of people only spoke English at home. The most common responses for religion were No Religion 31.5%, Catholic 23.4% and Anglican 21.4%.