"Weir" is a song by Australian rock band Killing Heidi, released in May 1999 as the first single from their debut studio album, Reflector (2000).

The song became a teen anthem in Australia the year of its release, reaching number six on the ARIA Singles Chart, and remains the band's best-known single.

In the United States, the song was released to alternative radio on 25 July 2000.

The music video was partially filmed in Sydney's Centennial Park.

^ Shipments figures based on certification alone.