Glan prism or Glan polarizer may refer to:
- Glan–Thompson prism, a polarizer made from cemented calcite prisms
- Glan–Foucault prism, a polarizer made from air-spaced calcite prisms
- Glan–Taylor prism, an improved air-spaced calcite polarizer design
- Glan–laser prism, a high-power Glan–Taylor prism