Stanerra (foaled 4 May 1978) was an Irish Thoroughbred racehorse and broodmare. Unraced at two, she ran twice a three-year-old before showing improved form in 1982 when she won one race and was placed in several good middle-distance races. She reached her peak as a five-year-old in 1983 when she emerged as one of the leading middle-distance performers in Europe. After winning Brigadier Gerard Stakes in spring she showed outstanding form at Royal Ascot, winning the Prince of Wales's Stakes and then breaking the track record when taking the Hardwicke Stakes. In autumn she won the Joe McGrath Memorial Stakes in Ireland before becoming the first horse trained in Europe to win the Japan Cup. She was retired to stud after one unsuccessful run in 1984 but had no impact a broodmare.
