"(Love Is) Thicker Than Water" is a song performed by Andy Gibb, released in September 1977 as the second and final single from his debut album, Flowing Rivers. The song was his second single that topped the US Billboard Hot 100. It was mainly written by Barry Gibb, with help from Andy Gibb. The B-side of this song was "Words and Music" in the US, but "Flowing Rivers" in the UK. It became a gold record.

Andrew Roy Gibb was an English and Australian singer and songwriter. He was the younger brother of Barry, Robin, and Maurice Gibb, musicians who had formed the Bee Gees during the mid-1960s.