Mary R. Clancy, 79, of Castleton, New York passed away May 22, 2021 after a brief illness. Ms. Clancy was born in Albany, N.Y. on May 23, 1942, daughter of the late Helen (McAllister) and James H. Clancy. She was predeceased by her brothers, James J. and George R. Clancy. A graduate of St Rose College and Cortland University, she worked for the East Greenbush School District for 33 years before her retirement, serving as a physical education teacher and later a special education teacher. She was an avid UConn and Yankee fan. Mary learned to paint, knit, and play the guitar. She enjoyed traveling and spending time with family. She volunteered at the East Greenbush TOOLS Project for many years. She is survived by her eight nieces and nephews, Colleen Bautochka (Michael) of Richmondville, N.Y., Coby (David) Scaccia of Nassau, N.Y., Christopher Clancy of Castleton, Siobhan Sorak Horan (Martin) of Stratford, Ct, Sean Clancy (Mari A) of Hockessin DE, Kathleen Lozinak (David), Kevin Clancy, both of Shelton, CT and Rachel Clancy of Oxford, CT; many grand nieces and nephews, several great-grand nieces and nephews, as well as her sister-in-law Arlene A. Clancy. Services will be private.