In a Box is the first official release by Australian alternative rock group, Ammonia.

The five-track extended play was issued in October 1994 via the Murmur label and Sony Music Australia.

Australian musicologist, Ian McFarlane, felt that the EP "outlined the band's brand of guitar-driven power pop";[2] while AllMusic's Kim Summers wrote that it had "received rave reviews.

[5] The title track, "In a Box", was re-recorded and appeared on the group's debut album, Mint 400 (16 October 1995).

The United States version of their second EP, Sleepwalking (March 1996) on the Sony-associated label, Epic Records, had two tracks from In a Box: "White" and "Lucky No.