Sergius IV redirects here. It can also refer to Sergius IV of Naples, Duke of Naples in 1002–36.

Pope Sergius IV (970 – 12 May 1012) was Pope and the ruler of the Papal States from 31 July 1009 to his death in 1012.

He was born in Rome as Pietro Martino Buccaporci, which essentially translates as "Peter Pig's Snout." The date of his birth is unknown but is believed to be around 970.