The 1990 Connecticut Attorney General election took place on November 6, 1990, to elect the Attorney General of Connecticut. Incumbent Democratic Attorney General Clarine Nardi Riddle was appointed by Governor William O'Neill to fill the remainder of the term to which Joe Lieberman had been elected in 1986. Lieberman resigned on January 3, 1989, following his election to the U.S. Senate. Riddle did not seek election to a full term.
Democratic nominee and state senator Richard Blumenthal defeated Republican nominee E. Gaynor Brennan Jr.