Diallyltryptamine (DALT), also known as N,N-diallyltryptamine, is a tryptamine derivative which has been identified as a designer drug.

According to Alexander Shulgin in his book TiHKAL (Tryptamines I Have Known and Loved), the dose of DALT is greater than 40 mg orally and its duration is unknown. Its effects were not described. Per Stephen Szara and colleagues in much earlier publications however, DALT and other extended N,N-dialkyltryptamines produce similar effects to dimethyltryptamine (DMT) but are longer-lasting, with durations of up to 3 hours.

The receptor interactions of DALT have been studied. The drug produces the head-twitch response, a behavioral proxy of psychedelic effects, in rodents.

DALT has been used as an intermediate in the preparation of radiolabeled diethyltryptamine (DET).

The chemical synthesis of DALT has been described.

Analogues of DALT include 4-HO-DALT, 4-AcO-DALT, 5-MeO-DALT, and methylallyltryptamine (MALT), among others.

DALT was first described in the scientific literature by Stephen Szara and colleagues by 1962.