Samuel Roy "Sammy" Hagar (born October 13, 1947), also known as The Red Rocker, is an American rock vocalist, guitarist, songwriter and musician. Hagar came to prominence in the 1970s with the hard rock band Montrose. He afterwards launched a successful solo career, scoring an enduring hit in 1984 with "I Can't Drive 55". He enjoyed huge commercial success when he replaced David Lee Roth as the lead singer of Van Halen in 1985, but left the band in 1996. He returned to the band for a 2 year reunion from 2003 to 2005. On March 12, 2007, Hagar was inducted into the Rock and Roll Hall of Fame as a member of Van Halen.

Outside of music, he founded the Cabo Wabo Tequila brand and restaurant chain, as well as Sammy's Beach Bar Rum. His present musical project is lead singer of Chickenfoot.