S33
- Blériot-SPAD S.33
- County Route S33 (Bergen County, New Jersey)
- Letov Š-33
- Madras Municipal Airport
- S postcode area
- S33 (Long Island bus)
- S33 (ZVV)
- Section 33 of the Canadian Charter of Rights and Freedoms
- Short Empire
- Short S.27
- Sikorsky S-33 Messenger
- Sotho language
- Spectrum S-33 Independence
- Sulfur-33