Howard Chaim Cedar (Hebrew: חיים סידר; born January 12, 1943) is an Israeli American biochemist who works on DNA methylation, a mechanism that turns genes on and off.

Howard Chaim Cedar was born in the United States.

[1] He is married to Zipora, a psychodramatist, and has six children, Joseph (a film writer and director), Dahlia, Noa, Yoav, Yonatan and Daniel, and 24 grandchildren.

From 1971 to 1973 he was in the U.S. Public Health Service at the National Institutes of Health in Bethesda, Maryland.

[1] In 1973 he joined the medical school of the Hebrew University in Jerusalem, and now serves as professor emeritus in the Department for Developmental Biology & Cancer Research, The Institute For Medical Research, Israel-Canada (IMRIC).