Richard George Lines (born August 17, 1938) is a Canadian former Major League Baseball relief pitcher who appeared in 107 games for the Washington Senators in 1966 and 1967.

Born in Montréal but a graduate of Manchester High School in Midlothian, Virginia, Lines spent 13 years in professional baseball (1957–1969).

He threw left-handed, batted right-handed, and was listed as 6 feet 1 inch (1.85 m) tall and 175 pounds (79 kg) (12 stone, 7 lbs).

Lines was signed by the Pittsburgh Pirates before the 1957 season, and was a starting pitcher for eight years in the minor leagues before being converted to relief in 1965 with the Hawaii Islanders of the Triple-A Pacific Coast League.

He made the Washington club the next year, and was an effective relief pitcher for the Senators during his two full seasons with them.