P55 or P-55 may refer to:
Vessels , a patrol boat of the Argentine Navy , a submarine of the Royal Navy , a patrol vessel of the Royal New Zealand Navy , a patrol vessel of the Indian Navy
Other uses Curtiss-Wright XP-55 Ascender, an American experimental fighter aircraft Intel P55, a computer chipset Papyrus 55, a biblical manuscript PIK3R3, phosphatidylinositol 3-kinase regulatory subunit gamma Tumor necrosis factor receptor 1 P55, a state regional road in Latvia