| Semi-Mental | |
| Cover: | Semi-Mental.jpg |
| Type: | single |
| Artist: | Biffy Clyro |
| Album: | Puzzle |
| Released: | 25 December 2006 |
| Recorded: | The Warehouse Studio Vancouver, British Columbia The Farm Studios Gibsons, British Columbia |
| Genre: | Alternative metal |
| Length: | 4:09 (Album version) 3:22 (Single version) |
| Label: | 14th Floor |
| Producer: | Garth Richardson |
| Prev Title: | Only One Word Comes to Mind |
| Prev Year: | 2005 |
| Next Title: | Saturday Superhouse |
| Next Year: | 2007 |
"Semi-Mental" is a song by Biffy Clyro and the first single from their fourth album, Puzzle, and is a download only single. It was released on 25 December 2006. The song was not UK singles chart eligible as at the time, downloads only counted towards charts sales if there was a physical release.
Simon Neil has commented on the song, saying
The song was also named single of the week by Kerrang! magazine. At the beginning of the music video, the words "Play Louder" are displayed. This is a reference to Audioslave's video for "Cochise", which displays the words "Play Loud" at the beginning
Songs and lyrics by Simon Neil. Music by Biffy Clyro.