Agnes Christine Johnston was an American screenwriter who wrote for more than 80 films between 1915 and 1948.

She attended the Horace Mann School and later took a playwright class at Harvard.

When Vitagraph gave her an assignment to write a scenario for a James Oliver Curwood novel God's Country and the Woman, she reportedly completed the scenario in 24 hours.

She also wrote the musical comedy The Time, the Place and the Girl.

Johnson was married to fellow screenwriter Frank Mitchell Dazey; the couple had three children together.