Peter Roy Sears (born 27 May 1948) is an English rock musician. In a career spanning more than four decades he has been a member of many bands and has moved through a variety of musical genres, from early R&B, psychedelic improvisational rock of the 1960s, folk, country music, arena rock in the 1970s, and blues. He usually plays bass, keyboards, or both in bands.

Sears played on the classic Rod Stewart albums Gasoline Alley, Every Picture Tells A Story (which was listed high in Rolling Stone Magazine's top 500 best albums of all time), Never a Dull Moment, and Smiler. He also played on the hit singles Maggie May, and Reason To Believe. During this period, Sears toured the US with Long John Baldry blues band, and played with John Cipollina in Copperhead.

Sears was with Jefferson Starship (1974 to 1984) and its offspring Starship (1985 to 1987). He went on to play in the Jorma Kaukonen Trio with Kaukonen and Michael Falzarano. He also played with Kaukonen and Falzarano along with Jack Casady and Harvey Sorgen in Hot Tuna.

Sears has played with many other musicians through the years, including Dr. John, John Lee Hooker, Leigh Stephens and Micky Waller in Silver Metre; Long John Baldry, Copperhead with John Cipollina, Jerry Garcia, Steve Kimock, Bob Weir, Phil Lesh, Leftover Salmon, and Los Lobos. Currently, he divides his time between the David Nelson Band and his main band Moonalice.

Sears has also written and recorded the original score for many documentary films, including the award-winning "The Fight in the Fields" – Cesar Chávez and the Farmworkers Struggle directed by Emmy Award-winning Ray Telles and Rick Tehada Flores. His most recent film, also directed by Ray Telles and co-produced by Ken Rabin is called "The Storm That Swept Mexico" about the Mexican Revolution which will air on National PBS in May 2011.