Kalman Jacob Mann (Hebrew: ???? ???? ???) (5 July 1912 – 14 March 1997) was an Israeli physician specializing in pulmonology, and the eighth and longest-serving director general of the Hadassah Medical Organization.
During his three decades at the helm of the Hadassah HMO, he was credited with the renovation of the hospital campus on Mount Scopus after the Six-Day War, and the construction of a new Hadassah medical center at Ein Kerem.
He also sat on 14 different government committees, influencing Israeli health-care legislation.
Following his retirement from Hadassah in 1981, Mann shepherded the development of the Yad Sarah medical equipment lending organization, serving as its chairman until his death in 1997.