Frank Willey Clancy (15 January 1852 – 1 September 1928) was Attorney General of New Mexico (1909–1916), as well as Mayor of Albuquerque (1898).
In 1879 he moved to Santa Fe, New Mexico, where he married Charlotte Jane Cawthorne Swallow on 30 October 1879.
She was the daughter of Reverend Benjamin Swallow, and was born in London, England.
In 1912 Governor William McDonald requested Clancy to determine the boundary between New Mexico and Texas.
He also acted as Special Counsel for New Mexico in suits against Colorado and Texas.