P50

P50, P-50, or P.50 may refer to:

• P50 (biochemistry), in biochemistry, the partial pressure of a gas required to achieve 50% enzyme saturation
• P50 (neuroscience), an auditory event related potential recorded using EEG
• Honda P50, a moped introduced in June 1966 known as the P25 in some markets
• Peel P50, a three-wheeled microcar manufactured in 1962 and 1965 by the Peel Engineering Company in the United Kingdom
• P.50, the designation of several variants of the Percival Prince, a late 1940s British light transport aircraft
• Piaggio P.50, an Italian heavy bomber prototype of 1937-1938
• Pottier P.50, a French racing aircraft developed in the late 1970s
• PZL P.50, an alternative designation for the PZL.50 Jastrząb, a Polish fighter aircraft of the late 1930s
• Grumman XP-50, an American twin-engine heavy fighter aircraft prototype of 1941
• NF-κB1, a protein of the NF-κB family; see NFKB1
• The 50th Percentile (usually stylized p50), or equivalently the Median or the second Quartile