Lonnie Hillyer (March 25, 1940 in Monroe, Georgia – July 1, 1985 in New York City) was an American jazz trumpeter, strongly influenced by Dizzy Gillespie, Charlie Parker, Thelonious Monk and other bebop legends of that era.
Lonnie Hillyer's association with Mingus lasted more than a decade, performing on records such as "My Favorite Quintet" and "Let My Children Hear Music".
Around 1983 he and (former Monk tenor saxophonist) Charles Rouse formed a jazz quintet ("Bebop Quintessence"), with (drummer) Leroy Williams, (pianist) Hugh Lawson and (bassist) Ben Brown.
Hillyer performed live with many musicians including Thelonious Monk, Art Blakey, Philly Joe Jones, Willie Bobo, Barry Harris, Walter Davis, Jr., Abbey Lincoln, and many others.
His son, Lonnie D. Hillyer, is a rock bassist (J. Walter Negro & The Loose Jointz, Maggie's Dream, Billy Joel, Gordon Gano, Bernie Worrell, Andrea Álvarez).