John Conant Flansburgh (born May 6, 1960) is an American musician. He is half of the long-standing Brooklyn, New York-based alternative rock duo They Might Be Giants, for which he writes, sings, and plays rhythm guitar. He is left-handed.
Commonly referred to by the nicknames Flans or Flansy, he is married to musician Robin Goldwasser, with whom he occasionally performs.