Poss

Poss may refer to:
 * National Geographic Society – Palomar Observatory Sky Survey, a major photographic survey of the night sky
 * Professional open-source software
 * Polyhedral oligomeric silsesquioxane, an organic-inorganic hybrid compound with inorganic cubic core and outer organic groups.
 * Post Open Source software

People

 * Barry Poss, co-founder of bluegrass label Sugar Hill Records
 * Greg Poss (b. 1965), former American hockey player and current coach
 * Nadine Poss (b. 1991), the 2013/14 German Wine Queen
 * Reinhold Poss (1897–1933), German flying ace and racing pilot
 * Robert Poss, an American guitarist and music producer