YEC may refer to: Year-End Championships, unofficial name of the annual season-ending pro tennis events ATP World Tour Finals (men's tennis) WTA Championships (women's tennis) Yeniche language (ISO 629-3 code), a variety of German spoken in Europe Ying e Chi, a non-profit organization of independent filmmakers in Hong Kong Yorkshire Engine Company, a former locomotive manufacturer in Sheffield, England Young Earth creationism, a religious belief that life and earth were created within 6 thousand to about 10 thousand years ago Yukon Energy Corporation, a Canadian Crown corporation in the Yukon Yecheon Air Base, the IATA code YEC