John Joseph Barry (April 4, 1940-April 9, 2000) was an American trial lawyer and former Assistant United States Attorney.
His father was James J. Barry of New York. Barry graduated from the Pratt Institute and New York University School of Law.
In 1973, as Assistant United States Attorney, he testified for the prosecution in the Camden 28 case that resulted in acquittal by jury nullification.
He was a partner in the law firm of Tompkins, McGuire, Wachenfeld & Barry in Newark, New Jersey. Among his clients were his brother-in-law Donald Trump and electronics retail executifive "Crazy" Eddie Antar, who was accused of fraud in 1986.
He was married to Judge Maryanne Trump Barry in 1982, with whom he had one daughter and one stepson. Through her, he was brother-in-law to Donald Trump, the 45th and 47th President of the United States. He died of cancer on April 9, 2001.