P45 may refer to:
Vessels , a corvette of the Argentine Navy , a submarine of the Royal Navy
Other uses P45 (tax), a form designation used as a metonym for termination of employment Bell P-45, an American fighter aircraft later redesignated P-39C Intel P45, a computer chipset Mount Pleasant/Scottdale Airport, in Fayette County, Pennsylvania, United States P45 road (Ukraine) Papyrus 45, a biblical manuscript Pneumonoultramicroscopicsilicovolcanoconiosis, a synonym for the disease known as silicosis P45, a state regional road in Latvia P45, a digital camera back made by Phase One The Clarkson P45, a hybrid microcar made by Jeremy Clarkson on Top Gear "P.45", a song by Gorillaz and Spacemonkeyz from Laika Come Home
See also Ferrari P4/5 by Pininfarina, an Italian sports car