(12 September 1923 - 10 June 1967) (his death) (2 children)
Tracy met actress Louise Treadwell while they were both members of the Wood Players in White Plains, New York—the first stock company Tracy joined after graduating. The couple were engaged in May 1923, and married on September 10 of that year between the matinee and evening performances of his show.
Their son, John Ten Broeck Tracy, was born in June 1924. When John was 10 months old, Louise discovered that the boy was deaf. She resisted telling Tracy for three months. Tracy was devastated by the news and felt a lifelong guilt over his son's deafness. He was convinced that John's hearing impairment was a punishment for his own sins. As a result, Tracy had trouble connecting with his son and distanced himself from his family. Joseph L. Mankiewicz, a friend of Tracy's, later theorized: "[Tracy] didn't leave Louise. He left the scene of his guilt." A second child, Louise "Susie" Treadwell Tracy, was born in July 1932. The children were raised in their mother's Episcopalian faith.
Tracy left the family home in 1933, and he and Louise openly discussed the separation with the media, maintaining that they were still friends and had not taken divorce action. From September 1933 to June 1934, Tracy had a public affair with Loretta Young, his co-star in Man's Castle. He reconciled with Louise in 1935. There was never again an official separation between Tracy and his wife, but the marriage continued to be troubled. Tracy increasingly lived in hotels and by the 1940s, the two were effectively living separate lives. Tracy frequently engaged in extramarital affairs, including with co-stars Joan Crawford in 1937 and Ingrid Bergman in 1941.