Apollo 440 (alternately known as Apollo Four Forty or @440) are an English band formed in Liverpool in 1990. Apollo 440 have written, recorded and produced five albums, collaborated with and produced other artists, remixed as Apollo 440 and as ambient cinematic alter-ego Stealth Sonic Orchestra, and created music for film, television, advertisements and multimedia. During their eleven years at Sony, 1993–2004, they notched up 11 Top 40 UK singles with three Top 10s, and had a chart presence worldwide.

The name comes from the Greek god Apollo and the frequency of concert pitch — the A note at 440 Hz, often denoted as "A440", and the Sequential Circuits sampler/sequencer, the Studio 440. They changed the writing of their name from Apollo 440 to Apollo Four Forty in 1996, though they switched back for their latest album.