The Electric Kool-Aid Acid Test, a novel written by Tom Wolfe

Acid Test, 2007 album by Cosmosquad.

"The Acid Test", a short story by Ian Rankin.

Acid2, a Cascading Style Sheets test

a method using aqua regia to determine if real gold is found

in petrology, using acid to test rock or soil for carbonates

Litmus test (chemistry), a common pH test

Acid Test (Liquidity Ratio), a ratio used to determine the liquidity of a business entity.

a phrase that refers to a foolproof test that will accurately determine the validity of something

the "Acid Tests" conducted by the Merry Pranksters (and chronicled by Tom Wolfe)

Acid Test (band), a Canadian alternative rock band best known for its collaborations with the film Highway 61