Dreier
Dreier is German for "three-er" and may refer to:
- Dreier (coin), an historical German coin
 - Dreier (Königrufen), a contract in the Tarot game of Königrufen
 - Dreier (surname), people with the surname
 - Dreier (Tapp Tarock), a contract in the Tarot game of Tapp Tarock