Dark Lomond (7 June 1985 – after 1996) was an Irish thoroughbred racehorse and broodmare. She showed promise when finishing second on her only run as a juvenile in 1987 and developed into a high-class middle-distance performer and stayer in the following year. She won the Phoenix Oaks Trial and the Pretty Polly Stakes in June 1988 and returned in October to record her biggest victory in the Irish St Leger. After her racing career ended she became a broodmare and had some success as a dam of winners.