Phobos, Greek for "fear", is the root word of phobia. It may also refer to:

• Phobos (mythology), one of the sons of Ares and Aphrodite in Greek mythology.
• Phobos (moon), the larger and innermost of Mars' two moons.
• Phobos program, consisting of two unmanned probes, Phobos 1 and Phobos 2, sent to Mars by the Soviet Union.
• Phobos (known as Huitzil outside of Japan), a character in Capcom's fighting game series Darkstalkers as well as in the hit game Quake III.
• Phobos, the standard runtime library of the D programming language.
• Phobos, a name of a villain in ''W.I.T.C.H.', the unrightful ruler of Meridian during the first saga.
• Phobos (physics) is a nuclear physics experiment.
• Project Phobos is a lightweight, scripting-friendly, web application environment running on the Java platform.

Фобос | Phobos | Phobos (måne) | Phobos | Fobos | Phobos | פובוס | Fobas (reikšmės) | Phobos | フォボス | Фобос (значения) | Fobos