The Diocese of Tulsa also called the Diocese of Tulsa and Eastern Oklahoma (Latin: Dioecesis Tulsensis) is a Latin Church diocese of the Catholic Church in the eastern part of Oklahoma in the United States. It is a suffragan diocese of the metropolitan Archdiocese of Oklahoma City.

The mother church of the diocese is Holy Family Cathedral in Tulsa. The bishop as of 2023 is David Konderla.

The Diocese of Tulsa covers 26,417 square miles (68,420 km) over 31 counties in eastern Oklahoma – including the most populous county, Tulsa County.

The diocese has 78 parishes (including mission churches) The official news and information publication of the diocese is The Eastern Oklahoma Catholic.

After the Louisiana Purchase in 1803, it became the plan of the U.S. government to force Native American tribes from the Eastern United States into the Great Plains region. The eastern part of present-day Oklahoma was part of this loosely defined region known as the Indian Territory.

For the Catholic church, all of the Indian Territory became part of the Diocese of St. Louis in 1826. It was passed to the new Diocese of Little Rock in 1843. The first Catholic church in the Indian Territory was constructed in 1872 in Atoka by Irish workers building the Missouri-Kansas-Texas railroad.

In 1875, the Diocese of New Orleans sent French Benedictine monks to minister to the tribes in the Indian Territory. They established St Gregory's Abbey in Shawnee in 1876. That same year, Pope Pius IX erected the Apostolic Prefecture of Indian Territory, taking jurisdiction for the Indian Territory away from the Diocese of Little Rock. In 1890, the US Government separated western Oklahoma from the Indian Territory, founding the Oklahoma Territory.

In 1891, Pope Leo XIII elevated the apostolic prefecture to the Apostolic Vicariate of Indian Territory, continuing its jurisdiction over the Oklahoma and Indian Territories. The first parish in Tulsa, Holy Family, opened in 1899.

In 1905, Pope Pius X erected the Diocese of Oklahoma City, covering both the Oklahoma and Indian Territories. Two years later, the two territories were combined to create the new State of Oklahoma.

Pope Pius XI renamed the Diocese of Oklahoma City to the diocese of Oklahoma City-Tulsa in 1930, due to the population growth of Tulsa and its surrounding communities. The Tulsa area would remain part of this diocese for the next 42 years.

Pope Paul VI erected the Diocese of Tulsa on December 13, 1972, removing eastern Oklahoma from what became the Archdiocese of Oklahoma City. The pope named Monsignor Bernard Ganter as the first bishop of Tulsa. He served in Tulsa for four years before being named bishop of the Diocese of Beaumont.

The next bishop of Tulsa was Reverend Eusebius J. Beltran from the Diocese of Atlanta, appointed by Pope John Paul II in 1978. Most notable among his charity work were his efforts to assist persons in need, including unwed mothers, HIV/AIDS victims, homeless families, and women who had just been released from prison. Beltran was appointed archbishop of Oklahoma City in 1992.

Pope John Paul II selected Reverend Edward Slattery of the Archdiocese of Chicago to replace Beltran in Tulsa in 1993. Slattery served for 23 years before retiring in 2016.

The current bishop of Tulsa is David Konderla from the Diocese of Austin, named by Pope Francis in 2016.

A 13 year old girl and her parents reported to the diocese in 1999 that she had been sexually molested that year by Reverend John Jangam, a visiting priest from India. It was stated that on separate occasions, Jangram touched her inappropriately. After receiving the allegations, the diocese sent Jangam back to India. In 2002, the girl publicly revealed her story.

In July 2002, the diocese abruptly removed Reverend Kenneth Lewis from St. John the Evangelist Church in McAlester after several parents complained about his inappropriate behavior with their children. In 1994, a diocesan employee had reported seeing Lewis give a backrub to a boy in Lewis' bedroom. After the employee told the boy's parents and they complained to the diocese, Bishop Slattery sent Lewis away for treatment. Lewis later returned to ministry. Slattery in August 2002 admitted making a mistake in allowing Lewis in 1994 to return to ministry.

In March 2007, the diocese was sued in Illinois by the parents of a then 14 year-old boy who they alleged was sexually assaulted by Lewis on a trip to Evanston, Illinois, in 2001. The statute of limitations had passed on criminal prosecution. Lewis was laicized by the Vatican in July 2007.

The diocese in October 2019 released a list of 11 clergy with credible accusations of sexual abuse of minors dating back to 1973.

1. Bernard J. Ganter (1972–1977), appointed Bishop of Beaumont
2. Eusebius J. Beltran (1978–1992), appointed Archbishop of Oklahoma City
3. Edward James Slattery (1993–2016)
4. David Konderla (2016–present)

• Peter Bryan Wells, appointed titular Archbishop and nuncio in 2016
• Daniel Henry Mueggenborg, appointed auxiliary bishop of Seattle in 2017

The superintendent of the diocese is David Dean.

• Bishop Kelley High School – Tulsa
• Cascia Hall Preparatory School – Tulsa

Te Deum Institute of Sacred Liturgy

See: List of the Catholic bishops of the United States#Province of Oklahoma City

• Roman Catholic Diocese of Tulsa Official Site
• Archdiocese of Oklahoma City official website

36°07′53″N 95°56′14″W / 36.13139°N 95.93722°W / 36.13139; -95.93722