John B. Orr Jr. (c. 1920 – July 25, 1974) was an American attorney and politician who served as a member of the Florida House of Representatives and as the Mayor of Metropolitan Dade County from 1972 to 1974.

During his tenure in the House, Orr was the only member who voted against school segregation in 1956.

[1] Orr was a mentor to Janet Reno during her early career in Miami-Dade County politics.

[2] In 1972, Orr was elected the third mayor of Miami-Dade County, Florida.

Orr died of cancer in 1974 and was succeeded by Stephen P.