P9 or P-9 may refer to: *

Planet Nine Planet Nine is a List of hypothetical Solar System objects, hypothetical ninth planet in the outer region of the Solar System. Its gravitational effects could explain the peculiar clustering of orbits for a group of extreme trans-Neptunian obj ...

, a hypothetical new planet in the far outer solar system * Boeing XP-9, a prototype fighter aircraft from the 1930s * Heckler & Koch P9, a semi-automatic pistol * Springfield Armory P9, a semi-automatic pistol * Peruvian Airlines IATA airline designator * P9 (band), a Brazilian boyband * Power Nine, a set of 9 rare cards from the ''Magic: The Gathering'' TCG, widely considered to be the most powerful cards ever printed in the game. * Psyclon Nine, an aggrotech band * P-9 Project

See also