The video game publisher has joined with a number of businesses to sign a petition that opposes the Defense of Marriage Act (DOMA).
In a statement on its website, EA urges the Ninth Circuit Court of Appeals to find portions of the Act, which defines marriage as between a man and a woman, unconstitutional.
"DOMA presents a number of problems for businesses like EA, as it creates regulatory, tax and discrimination complications for employers, and that's why we're standing against it," reads an EA statement.
"The underlying lawsuit impacts all employers no matter how big or small, and no matter the industry, and we encourage other business to join these efforts."
EA has previously been criticised for the inclusion of homosexual sub-plot scenes in Mass Effect 3 and Star Wars: The Old Republic.
Right-wing groups in America, such as the Family Research Council, have accused the publisher of corrupting children and young people.
Watch EA's 'It Gets Better' campaign video below: