Joan A. Lenard (born 1952) is an American lawyer and judge. She currently serves on the United States District Court for the Southern District of Florida.

Lenard was born in 1952 in Amityville, New York. She received her Associate of Arts degree from Rockland Community College in 1972, her Bachelor of Arts from Roger Williams College in 1973, and her J.D. from Antioch School of Law in 1976.

Lenard worked for the Office of the State Attorney in the 11th Judicial Circuit of Florida (Dade County) from 1976 to 1982, serving as assistant state attorney from 1976 to 1978, as chief of the Consumer Fraud Division from 1978 to 1980, and as chief of the Consumer and Economic Crime Division from 1980 to 1982. Lenard served as a Dade County Court judge from 1982 to 1993 and as a circuit judge for the Family Division of the 11th Judicial Circuit from 1993 to 1995.