George Otto Emil Lignac (1891–1954) was a Dutch pathologist-anatomist.
The disease Lignac-Fanconi syndrome is named for him. (later: Abderhalden etc. disease)
Lignac was born in Passoeroean, Java, Dutch East Indies where his father worked as a civil servant. He studied medicine at Leiden and then returned to the Dutch East Indies and was a teacher at the S.T.O.V.I.A.(School for Native Indies doctors) Batavia.
He returned to the Netherlands and was appointed Professor of pathology, general diseases, pathological anatomy, and juridical medicine in Leiden in 1934.
He published work on skin pigmentation, cysteine metabolism and the carcinogenic nature of benzol and many more.
Lignac died in a plane crash in the river Shannon (Ireland) in 1954.