David Klein (1908 – 1993) was a Swiss human geneticist and ophthalmologist. Klein graduating from the University of Basel in 1934. After graduating, he worked at the Rheinau Psychiatric Clinic, Zurich. He moved to Geneva as scientific assistant to professor Adolphe Franceschetti at the ophthalmological clinic. In 1970 he was appointed full professor. He retired in 1978 with the status of professor emeritus. After retirement, he was active as consultant in human genetics at the ophthalmological clinic, Geneva, and the school of amblyopic and blind children in Baar, Switzerland.