James Hyndman MacDonnell FRSA (1885-13 September 1964) was a solicitor and Labour Party politician.
The son of Mark Antony MacDonnell and Mary Frances nee Hyndman, he was born in Marylebone. His father was a doctor of medicine born in County Mayo, Ireland, while his mother was born in Boston, Massachusetts, USA.
He was a member of the London County Council from 1928-1955. He represented Southwark North until 1949 and following boundary changes Southwark 1949-55. He was involved in with the Survey of London for 36 years. He was also a member of Battersea Borough Council.
He stood for the Labour Party as parliamentary candidate for Westminster, Abbey at the 1929 General Election. It was a safe Conservative seat and he about a quarter of the votes in a straight fight with Otho Nicholson.
He was married three times: to Beryl Gwendolyn Smith (died 1920) in 1912 and to Norah St Lawrence Linklater (died 1926) in 1920. His final marriage, in 1928, was to Lucy Eleanor Frances Preston (died 1962).