John Isaacs is a hair stylist and designer, known for his work with film stars, including Julie Andrews. He styled Andrews' hair for the movies: 10 (1979), S.O.B. (1981), Victor/Victoria (1982). He also styled the hair of Candice Bergen, star of the TV-series Murphy Brown.

John Isaacs is the co-founder of Michaeljohn, that was started in 1967 by British stylists Michael Rasser and John Isaacs himself, who envisioned a salon with expert services delivered in a comfortable, relaxing atmosphere. Clients of Michaeljohn have included actors Minnie Driver, Liza Minelli, Julie Andrews, and Dustin Hoffman, members of the royal family, politicians and diplomats. Some clients remained loyal to the Michaeljohn salon for 30 years.