Gordon J. MacDonald (born November 27, 1961) is an American attorney who has served as the chief justice of the New Hampshire Supreme Court since 2021. He previously served as the 30th attorney general of New Hampshire from 2017 to 2021.

MacDonald was born in 1961 in Los Angeles, California to Marcelline (Kuglen) MacDonald and Gordon J. F. MacDonald, a geophysicist and environmental scientist.

MacDonald attended public schools in Hanover, New Hampshire, graduating from Hanover High School. He earned a Bachelor of Arts in government, cum laude, from Dartmouth College in 1983.

From 1985 to 1990, MacDonald worked as legislative director for United States Senator Gordon J. Humphrey. In 1990, he became Humphrey’s Chief of Staff.

In 1994, MacDonald earned a juris doctor, magna cum laude, from Cornell Law School. At Cornell, he worked as an article editor for the Cornell Law Review and was a member of the Order of the Coif.

From 1994 to 1995, MacDonald clerked for judge Norman H. Stahl of the United States Court of Appeals for the First Circuit.

In 1995, MacDonald became an associate in the litigation department of Hale and Door LLP in Boston. In 1997, he became an associate at Nelson, Kinder, Mosseau & Gordon, PC in Manchester, New Hampshire. In 2001, he became an associate in the litigation department of Nixon Peabody, also in Manchester. In 2005, he became a partner in the same department of Nixon Peabody, holding that role until his appointment as attorney general.

From 2004 to 2017, MacDonald served on the New Hampshire Supreme Court Board of Bar Examiners, chairing the board from 2010 to 2017.