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thumb|alt=Lucille Mulhall, standing on the back of a seated horse|Mulhall performing
Lucille Mulhall (October 21, 1885 – December 21, 1940) was a well-known cowgirl and Wild West performer.
She was born in St. Louis, Missouri to Zach and Agnes Mulhall. Her parents brought her to the Oklahoma Territory in 1889. She was raised on her family's Mulhall Ranch in Oklahoma Territory, near what is now Mulhall, Oklahoma.
Known as one of the first women to compete with men in roping and riding events, she was called Rodeo Queen, Queen of the Western Prairie, and Queen of the Saddle (among many other appellations). She began performing in her father's rodeo show, the Mulhall Wild West Show, in 1899. Alongside other acts from her father's show, she performed at President William McKinley's inauguration ceremony in 1901. and into the National Cowgirl Museum and Hall of Fame in 1977.
Mulhall died in Logan County, Oklahoma, in an automobile accident less than a mile from the Mulhall Ranch.