Pat DiNizio (born October 12, 1955), of Scotch Plains, New Jersey, is the lead singer, songwriter, and member of the band The Smithereens, which he formed in 1980 with Jim Babjak, Dennis Diken and Mike Mesaros, from Carteret, New Jersey.

In addition to the Smithereens' body of work, DiNizio has also released a number of solo albums, Sounds and Songs (1997), This is Pat DiNizio, a collection of cover songs arranged for piano and vocals (2006), Revolutions (2 CDs plus 1 DVD, limited edition of 300 copies, 2006), Pat DiNizio (2007), and Pat DiNizio/Buddy Holly (2008). An expanded 2-CD version of This is Pat DiNizio was issued in 2011.

In 2000, DiNizio made an unsuccessful run for the New Jersey seat of the United States Senate, running on the Reform Party ticket. He finished 4th with 19,312 votes (0.64%). The campaign was chronicled in the 2001 documentary film Mr. Smithereen Goes to Washington.

The same year, he launched the "Living Room Tour," a five-month jaunt where he performed solo, by request only, in the homes of fans. The tour was a success, and he still occasionally books similar concerts for a nominal fee.