Mary Bonauto, the Maine attorney who successfully argued before the U.S. Supreme Court this year for same-sex couples to have the right to marry, will be honored Wednesday night by the Maine Trial Lawyers Association.

The association’s president, Michael Welch of the law firm Hardy, Wolf and Downing, will present the award to Bonauto at its annual Legends Dinner, beginning at 7 p.m. at the Westin Portland Harbor View hotel. Bonauto will also speak.

Bonauto, who lives in Portland, is the civil rights project coordinator for the Boston-based Gay & Lesbian Advocates & Defenders. She won the nation’s first case regarding same-sex marriage, allowing same-sex marriage in Massachusetts in 2003.

During Bonauto’s career at GLAD, where she has worked since 1990, she has been involved in every major state and federal legal battle over same-sex marriage.