Mary-Dulany James (born February 1, 1960) is an American politician who has represented District 34 in the Maryland Senate since 2023.

She was previously a member of the District 34A in the Maryland House of Delegates for sixteen years, representing Harford and Cecil Counties along the U.S. Route 40 corridor.

[1] She grew up and still lives on her family's farm in Harford County, and attended Havre De Grace High School and the University of Maryland, College Park where she earned a B.S.

James attended the University of Maryland School of Law, earning a Juris Doctor degree with honors in 1986.

[12] She faced Republican challenger Bob Cassilly in the general election, and sought to position herself as an independent Democrat, noting her votes against gas- and sales-tax increases.

[15] She faced former state delegate Barbara Osborn Kreamer in the Democratic primary election,[16] which she won by a 3-to-1 margin.

[7] In January 2012, she formed a Blue Dog caucus in the state legislature along with other centrist Democratic members of the Maryland House of Delegates.

[35] In 2006, James voted for a bill that would create a ballot referendum to legalize same-sex marriage in Maryland.

[37] In April 2004, James was one of two Democratic state delegates to switch their no votes to yes to revive a $1 billion tax plan proposed by Speaker of the Maryland House of Delegates Michael E. Busch, after House Appropriations Committee Chairman Norman Conway persuaded her to change her vote.

[41] In March 2010, James said she opposed a bill that would give collective bargaining rights to librarians, saying that she thought it was inappropriate "for the state to be telling the local governments how to conduct themselves".