Tagalie (1909–1920) was British Thoroughbred racehorse. She was one of only six fillies to win The Derby, and was also the second of only four greys to have won the race. She achieved this feat as a three-year-old in 1912, a year in which she had already won the 1000 Guineas. Although her Derby win was easy and impressive, she failed to reproduce her winning form in her three subsequent races.