Ian MacDonald Lightbody, CMG, JP (19 August 1921 – 10 March 2015) was a Scottish-born Hong Kong civil servant and government official.
He was the first Secretary for Housing from 1973 to 1977 and official member of the Legislative Council of Hong Kong and Executive Council of Hong Kong.
Lightbody graduated from the University of Glasgow in 1946 with a Master of Arts degree.
He acted as Chief Secretary of Hong Kong in 1978.
Lightbody retired from the Hong Kong Government in 1978 and was appointed chairman of the Public Service Commission.