Deshamanya Hector Wilfred "Harry" Jayewardene, QC (November 3, 1916 - April 20, 1990) was a prominent Sri Lankan lawyer.
He quickly gained a reputation as a trial lawyer in both civil and criminal law in the unofficial bar, with a strong practice in the appellate courts.
He became the youngest person to be named to the prestigious position of Queen's Counsel in 1954.
He was part of the defense of the 1962 attempted coup suspects and defended Royal Dutch Shell ownership in Ceylon when nationalized in the 1960s.
He was the principal legal adviser to his brother J. R. Jayewardene, and the architect of the amendments to the Constitution of Sri Lanka in the late 1970s and early 1980s and served as a Special Envoy to the President.