Johnny Costa (January 17, 1922 – October 11, 1996) was an American jazz pianist born in Arnold, Pennsylvania. Given the title "the White Tatum" by jazz legend Art Tatum, Costa is best known for his work as musical director of the children's television program Mister Rogers' Neighborhood.

Costa learned to play accordion at age 7 and was reading music three years later. Frank Oliver, Costa's high school music teacher, urged him to learn the piano after discovering that Costa had perfect pitch. Costa graduated from Carnegie Mellon University with two degrees, in music and in education. In case he failed as a musician, Costa prepared himself to teach. Following college graduation, he began work the same day as the house pianist for a radio station in Pittsburgh. Eventually he performed the same role for KDKA-TV in Pittsburgh. He provided piano and organ music for many programs, eventually teaming with Fred Rogers to arrange and perform the music heard on Mister Rogers' Neighborhood for which he served as musical director until his death in 1996.