PL-1 or PL1 may refer to:
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PL/I, a programming language
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Lamson PL-1 Quark
The Lamson PL-1 Quark was an American high-wing, single-seat, glider that was designed and constructed by Philip Lamson, first flying in early 1965.Rogers, Bennett: ''1974 Sailplane Directory, Soaring Magazine'', page 45. Soaring Society of Am ...
, a glider
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Pazmany PL-1
The Pazmany PL-1 Laminar and Pazmany PL-2 are American two-seat trainer and personal light aircraft designed by Ladislao Pazmany to be marketed as a homebuilt aircraft by his company Pazmany Aircraft Corporation. The aircraft was built under lice ...
, a trainer aircraft
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K-5 (missile)
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