George Alcock MacDonnell (16 August 1830 in Dublin – 3 June 1899 in London) was an Anglican clergyman as well as a chess master and writer. He tied for 3rd-4th at London 1862 (the 5th British Chess Congress, Adolf Anderssen won),won two matches against George Henry Mackenzie (8 : 5) and (6.5 : 3.5) both at Dublin 1862, shared 1st with Wilhelm Steinitz at Dublin 1865, but lost a play-off game to him there, tied for 2nd-3rd at London 1866 (the 1st British Chess Championship, Cecil De Vere won), tied for 3rd-4th at Dundee (Gustav Neumann won),tied for 3rd-5th at London 1868/69 (the 2nd BCA Challenge Cup, Joseph Henry Blackburne and De Vere won),shared 3rd at London 1872 (Steinitz won),and took 4th at London 1872 (the 4th BCA Challenge Cup, John Wisker and De Vere won).