This race's Democratic margin of victory was the closest to the national average of 3.1 points.

As Connecticut does not have gubernatorial term limits, incumbent Democratic governor Dannel Malloy was eligible to run for a third term, but declined to do so.

[4][5] The general election was between 2006 Democratic U.S. Senate nominee Ned Lamont, and Republican financial executive Bob Stefanowski.

[6] The Republican statewide nominating convention was held May 11–12, 2018 at Foxwoods Resort Casino in Ledyard, Connecticut.

[88] with Ned Lamont and Mark Boughton with Ned Lamont and Erin Stewart with Susan Bysiewicz and Erin Stewart with Susan Bysiewicz and Mark Boughton with generic Democrat and Republican Lamont won four of eight counties, while Stefenowski won the other four.