Lust is an emotion or feeling of intense desire in the body. The lust can take any form such as the lust for sex, lust for expensive objects (extravagance) or the lust for power. It can take such mundane forms as the lust for food as distinct from the need for food. Lust is a psychological force producing intense wanting for an object, or circumstance fulfilling the emotion.

Lüst is a surname, and may refer to:

• Dieter Lüst (b. 1956), German theoretic physicist
• Reimar Lüst (b. 1923), German astrophysicist