DDG-78) USS "Porterfield" (DD-682) USS "Portland" (CA-33, LSD-37) USS "Portobago" () USS "Portsmouth" (1798, 1843, CL-102, SSN-707) USS "Portunus" (,) USS "Poseidon" () USS "Positive" () USS "Postmaster General" () USS "Potawatomi" () USS "Potomac" (1822, 1861, AT-50, AG-25, T-AOT-181) USS "Potomska" () USS "Potter County" (LST-1086) USS "Poughkeepsie" (PF-26) USS "Powder River" (LSM(R) – 519) USS "Power" (, DD-839) USS "Powhatan" (1850, 1861, 1898, SP-3013, YT-128)
Pr – Py USS "Prairie" (1890, AD-15) USS "Prairie Bird" () USS "Prairie Mariner" () USS "Prairie State" (IX-15) USS "Pratt" () USS "Preble" (1813, 1839, DD-12, DD-345, DDG-46, DDG-88) USS "Precept" () USS "Precise" () USS "Prefect" () USS "Prentiss" () USS "Prescott" () USS "Preserver" (ARS-8) USS "President" (1800, 1812) USS "President Adams" () USS "President Grant" () USS "President Hayes" () USS "President Jackson" () USS "President Lincoln" (1907) USS "President Monroe" () USS "President Polk" () USS "President Warfield" () USS "Presidio" () USS "Presley" () USS "Presque Isle" () USS "Prestige" (,) USS "Preston" (1864, 1865, DD-19, DD-327, DD-379, DD-795) USS "Pretext" () USS "Pretoria" () USS "Prevail" (AGOS-8) USS "Preventer" () USS "Price" (DE-332) USS "Prichett" (DD-561) USS "Pride" (DE-323) USS "Prime" (,