P30 or P-30 could refer to:
Consolidated P-30, a 1930s United States two-seater fighter aircraft
Heckler & Koch P30, a semi-automatic handgun
p30, an actin-binding protein
Prostate specific antigen, also known as P-30 antigen
Monthly summary of Employers Taxes form in Ireland (see Revenue On-Line Service)
P30, a patrol boat of the Armed Forces of Malta formerly the East German minesweeper Ueckermuende, now decommissioned.