Arthur Charles Bonsor (13 July 1882 - 25 July 1966) was a brewer and local politician.
He was the son of Sir Henry Cosmo Orne Bonsor, Baronet and member of parliament for North East Surrey and his wife Emily Gertrude née Fellowes. He became a director of the Stag Brewery, Pimlico and subsequently of Watney Combe & Reid Limited, an amalgamation of breweries formed through the actions of his father.
During the First World War Bonsor held a commission in the West Kent Yeomanry, a Territorial Force cavalry regiment, reaching the rank of major. He was decorated with the award of the Croix de Guerre (avec palmes).
In 1936 he was the President of the Licensed Victuallers Benevolent Institution, formed to provide accommodation and care for ex-publicans and their families in need.
A resident of Eaton Square, in the Belgravia district of Westminster, he entered politics as a member of Westminster City Council in 1925 when he was elected unopposed as a Municipal Reform Party councillor to represent Knightsbridge, St. George Ward. He was re-elected unopposed in 1928, 1931, 1934 and 1937. All local elections were suspended during the Second World War, with councils given the power to appoint individuals to fill casual vacancies. Bonsor continued his membership of Westminster City Council and in addition was appointed to fill a vacancy on the London County Council in September 1941 in the representation of the City of London. In 1942 he was appointed a Deputy Lieutenant of the County of London.
Local elections resumed in 1946 and Bonsor retained his seats on both Westminster City and London County Councils. He was now a member of the Conservative Party, the Municipal Reform Party, which had been allied to the Conservatives, having been wound up. He retired at the next council elections in 1948 (city council) and 1949 (county council) respectively.