PCB may refer to:

1. Brazilian Communist Party (in Portuguese, Partido Comunista Brasileiro)
2. Pakistan Cricket Board
3. PCBoard, a bulletin board system software
4. Polychlorinated biphenyl
5. Power circuit breaker (hardware)
6. Power control box (hardware)
7. Printed circuit board (hardware)
8. Process control block
9. Product configuration baseline
10. Program control block in Data Language/1
11. Protocol control block (networking)