Roy Sinclair Campbell Jr. (September 29, 1952 – January 9, 2014) was an American trumpeter frequently linked to free jazz, although he also performed rhythm and blues and funk during his career.

Born in Los Angeles, California, in 1952, Campbell was raised in New York City. At the age of fifteen, he began learning to play trumpet and soon studied at the Jazz Mobile program along with Kenny Dorham, Lee Morgan and Joe Newman. Throughout the 1960s, still unacquainted with the avant-garde movement, Campbell performed in the big bands of the Manhattan Community College. From the 1970s onwards, he performed primarily within the context of free jazz, spending some of this period studying with Yusef Lateef. Campbell composed the film music for the documentary Survival in New York (1989) by Rosa von Praunheim.

In the early 1990s, Campbell moved to the Netherlands and performed regularly with Klaas Hekman and Don Cherry. In addition to leading his own groups, he performed with Yo La Tengo, William Parker, Peter Brötzmann, Matthew Shipp, and other improvisors. Upon returning to the United States he began leading his group Other Dimensions In Music and also formed the Pyramid Trio, a pianoless trio formed with William Parker.

He died in January 2014 of hypertensive atherosclerotic cardiovascular disease at the age of 61.