Madanjeet Singh (b. April 16, 1924 in Lahore) is an Indian artist, writer, former diplomat and philanthropist. Since 2000 he has been a UNESCO Goodwill Ambassador.
He sponsored the bi-annual UNESCO-Madanjeet Singh Prize for the promotion of tolerance and non-violence. He created the South Asia Foundation in 2000 as a regional youth movement and it has now grown to have chapters in eight countries.He has been praised as a 'freedom fighter' by Taslima Nasreen for whom he had helped secure Indian Residency.He is a Secular Humanist.