The first Catholic mission in Texas, then part of the Spanish Empire, was San Francisco de los Tejas.

[7] During the 1960s, Harris put pressure on segregated Knights of Columbus councils in the diocese that refused to admit African-Americans.

[9] To replace Harris in Beaumont, Paul VI appointed Bishop Warren Boudreaux of the Diocese of Lafayette in Louisiana in 1971.

In 1974, Boudreaux began an outreach effort to people who made their living harvesting seafood and working on ships.

[12] Ganter also established a Catholic Charities office, a diocesan financial board, a retreat center, and a biblical school for adults.

In 1978, Reverend Judd Sivkovski, pastor at Assumption Church in Beaumont, was charged with sexually abusing a seven year old boy at his home.

[15] David Arceneaux of Nederland, Texas, sued the Diocese of Beaumont in 2010, claiming that he had been sexually abused by two diocesan priests, August Pucar and Roger Thibodeaux, when he was a minor.

[19] In 2019, the diocese issued a list of 13 clergy, living and deceased, with credible accusations of sexual abuse of minors.