9P or 9-P may refer to:
Science and technology 9P (protocol), a network protocol developed for the Plan 9 from Bell Labs distributed operating system 9P, NASA code for Progress M1-9 9p, an arm of Chromosome 9 (human) 9P/Tempel; see Tempel 1 Monosomy 9p, a chromosomal disorder due to deletion Tetrasomy 9p, a genetic disease due to inclusion
Engineering 9P, a variant of Salmson 9 9P, a model of AIM-9 Sidewinder GCR Class 9P, a class of British 4-6-0 steam locomotive Yak-9P, a model of Yakovlev Yak-9
Other uses New York State Route 9P
See also P9 (disambiguation)