Isaac Alfred Fisher (12 April 1851 – 19 June 1944) was an Australian cricket umpire who officiated in one Test match in Australia in 1884.
Before taking up umpiring he played for Hindmarsh (later renamed West Torrens), his fellow players including Affie Jarvis and Frank King.
[2] He made his debut as a first-class umpire in a match between South Australia and Victoria at Adelaide in February 1884.
His second first-class match as umpire was also the only Test match in which he officiated, the Ashes Test played between Australia and England at the Adelaide Oval in December 1884, when the Australian captain Billy Murdoch refused to accept the experienced English player and administrator James Lillywhite as umpire.
The Australian side had been weakened by the absence of Fred Spofforth and Billy Midwinter; George Giffen played despite suffering from rheumatism, and Alec Bannerman damaged his finger attempting to stop a ball in the field and was absent hurt in the Australian second innings.