Theia (1973 – after 1989) was a French Thoroughbred racehorse and broodmare. She was widely regarded as the best European filly of her generation in 1975, when she was unbeaten in three races including the Prix du Calvados and the Critérium des Pouliches. In the following year she added wins in the Prix Vanteaux and Prix de la Nonette and finished second in a strongly-contested renewal of the Prix Saint-Alary, but appeared to be just below top class. She was later exported to race in the United States, where she campaigned with limited success. She was later a useful broodmare, producing several winners.