Gordon Wong Wellesley (8 December 1894 – 1980) was an Australian-born screenwriter and writer of Chinese descent. Born in Sydney in 1894 He wrote over thirty screenplays in the United States and Britain, often collaborating with the director Carol Reed. He began his career in Hollywood in the early 1930s and worked in Britain beginning about 1935. He was married to the scriptwriter Katherine Strueby. He was nominated for an Oscar for Best Writing, Original Story at the 1942 Oscars for Night Train to Munich, which was based on his novel, Report on a Fugitive.

Gordon Wellesley Wong was born in Australia, of English and Chinese descent and was educated in London.

By 1923 his short stories such as A Lesson in Cocktails were appearing in magazines. A biography around this time called him "one of the best known commercial men in the Federated Malay states."

In 1931 he was living in Kuala Lumpur. (Another article says he was from Singapore.) He was reportedly "a business man as well as a traveler, writer, explorer and official film producer for the Malayan government." A 1931 profile said he was educated at the University of London and had directed a Malayan picture called Black Sands "which created a lot of excitement in Europe".

He travelled to Hollywood in 1931, when he was 36 years old. He sold the film rights to his novel, Pagan River to Universal. He also sold a story he wrote about the Sino-Japanese war called Shanghai Interlude which was going to be made by director John Ford and star Lew Ayres.

He was using the name "Wong Wellesley" around this time. He says he did this "because with a Chinese surname I might be expected to write nothing but Chinese stories."

Pagan River was filmed as Nagana (1933).

Wellesley also worked on the script for Shanghai Madness (1933) made with Spencer Tracy. In July 1933 he left Los Angeles for London.