A stoa (; plural, stoas, stoai, or stoae ), in ancient Greek architecture, is a covered walkway or portico, commonly for public use. Early stoas were open at the entrance with columns, usually of the Doric order, lining the side of the building; they created a safe, enveloping, protective atmosphere.

The Science and Technology Options Assessment (STOA) panel is a committee of members of the European Parliament devoted to all issues related to science and technology assessment.