Red clay, or Ultisol, is a type of soil.
Red clay may also refer to:
- Red clay used in pottery
- Pelagic red clay, a type of pelagic (deepwater) sediment
- Red Clay State Historic Park, Tennessee, U.S.
- Red Clay, Georgia, an unincorporated community
- Red clay, a type of clay court in tennis
- Hong Ni (红泥, literally, "red clay"), a type of Chinese clay used in pottery, see Yixing clay