Harold Grad (January 23, 1923 in New York City – November 17, 1986) was an American applied mathematician.

[1] Harold Grad was the founder of the Magneto-fluid Dynamics Division of the Courant Institute and served as its head until shortly before his death[2] From 1964 to 1967 and 1974 to 1977 he was a member of the Advisory Committee for Fusion Energy at Oak Ridge National Laboratory.

[3] Grad was a critic and supporter of many early fusion schemes including picket fences, magnetic mirrors and Biconic cusps.

The Courant Institute offers the Harold Grad Memorial Prize to outstanding performance and promise as a graduate student.

[2] Dr. Grad received a bachelor's degree in electrical engineering from the Cooper Union in 1943 and his masters at New York University in 1945.