PSW

PSW may refer to:

• Pacific South West, a region of the United States of America and Canada
• Pairwise Smith-Waterman algorithm, a matrix-based genecomparison algorithm
• Personal Support Worker, a Canadian term for a care worker
• PlayStation World, a British video game magazine
• Polish–Soviet War, February 1919–March 1921
• Program status word, a control register in IBM System/360 and successors systems architecture
• Baillie-PSW primality test, a mathematical deterministic primality testing heuristic
• Psychiatric Social Worker, a social worker who works with mentally ill people
• Part Submission Warrant, a document summarizing the package of documents used in a Production part approval process

PsW' may refer to:

• Prisoner of War