Leonard J. Russell (1932 – June 16, 1985) was a mayor (council chairman) of Cambridge, Massachusetts and husband of mayor Sheila Russell. Russel, a former waste disposal manager, represented traditional conservative blue collar workforce of Cambridge at the time when traditional neighborhoods were giving up to pressure from expanding universities and high technology companies.
Russell joined Cambridge local politics during the 1973 municipal council election. Two years later he won the council seat, followed by re-elections in 1979, 1981 and 1983. Russell launched his career as an independent candidate on a platform for a professional city management, and joined the bi-partisan coalition that was established to elect Walter J. Sullivan as mayor. Russell remained in alliance with Sullivan and in opposition to Cambridge Civic Association for most of his tenure, although eventually Sullivan sided with CCA.
Russell was elected mayor of Cambridge in January 1984; it was his fourth attempt for a mayor's seat. At first, the city council was split, with incumbent Alfred Vellucci and three other candidates, including Russell, competing for the job; media predicted a protracted campaign like that of 1948, when it took 43 weeks to elect a candidate. Russell, this time in alliance with liberal council members, nevertheless was elected after only four weeks of debate. He was immediately involved into clashes around the firing of long-term School Superintendent William Lannon, accused of political patronage but supported by the parents; the situation temporarily defused only in the end of October and was followed by a work-to-rule action by schoolteachers in November. He also had to moderate local campaign against nerve gas testing at Arthur D. Little. In another controversial move, Russell spoke to "stop the expansion of MIT and Harvard into Cambridge's neighborhoods" and intervened against Harvard University plans, declaring his intention to take the property owned by Harvard on eminent domain terms and redevelop it into low-income public housing.