James Dickson Leach, OBE, JP (19 July 1912 – 23 February 1992) was a British businessman in Hong Kong.
He was an unofficial member of the Legislative Council of Hong Kong in the 1960s.
He was elected chair of the Hong Kong General Chamber of Commerce in 1967.
He had served unofficial member of the Legislative Council of Hong Kong for several occasions in the 1960s as the chamber representative during the absence of W. C. G. Knowles and G. R. Ross.
He succeeded S. S. Gordon on 1 July 1966 and continued to serve on the council until his retirement in May 1968.