PSIS may refer to:
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Posterior superior iliac spine
The posterior border of the ala, shorter than the anterior, also presents two projections separated by a notch, the posterior superior iliac spine and the posterior inferior iliac spine. The posterior superior iliac spine serves for the attachme ...
, part of the human hip bone
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PSIS Semarang
Persatuan Sepak Bola Indonesia Semarang ( 'Indonesian Football Association of Semarang'), commonly known by its abbreviation PSIS is an Indonesian professional football club based in Semarang, Central Java. The club play their home matches in ...
, an Indonesian football team
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PSIS Co-operative, a financial services co-operative based in New Zealand
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