Lelan F. Sillin, Jr. (April 19, 1918 – January 3, 1997) was a pioneer in the nuclear power industry, an advocate of nuclear safety, and chairman and chief executive of Northeast Utilities. An early proponent of nuclear power, he was nevertheless critical of some nuclear operators who failed to strive for excellence in their work. Trained as an attorney, he first rose from general counsel to president and chief executive of Central Hudson Gas and Electric before ascending to the top of Northeast, Connecticut's largest public utility, a position he held from 1970 to 1983. He chaired the "Sillin Report", a 1986 analysis of the nuclear power industry, in which he chided some utility companies for simply meeting rather than exceeding regulatory requirements.