Israel Klabin (born 20 September 1926) is a Brazilian civil engineer, mathematician, environmentalist and politician.
He was born in Rio de Janeiro.
He served as the second Mayor of Rio de Janeiro from 15 March 1979 to 3 June 1980.
He was a member of the Brazilian Democratic Movement.After serving as mayor, Klabin was President of the State Bank of Rio de Janeiro from 1980 to 1983.