The Episcopal Diocese of Olympia, also known as the Episcopal Church in Western Washington, is a diocese of the Episcopal Church in Washington state west of the Cascade Range. It is one of 17 dioceses and an area mission that make up Province 8. The diocese started as a missionary district in 1853 and was formally established in 1910.

The name of the diocese refers to the region of "Olympia" and is not related to the state capital Olympia. The see city is Seattle, with St. Mark's the cathedral church of the diocese. Philip N. LaBelle was consecrated as the Diocese's ninth bishop on September 14, 2024.

These are the bishops who have served the territory now known as the Diocese of Olympia:

1. Thomas Fielding Scott (1854–1867)
2. Benjamin Wistar Morris (1868–1880)

1. John A. Paddock (1880–1894)
2. William Morris Barker (1894–1901)
3. Frederick W. Keator (1902–1910)

1. Frederick W. Keator (1910–1924)
2. S. Arthur Huston (1925–1947)
3. Stephen F. Bayne, Jr. (1947–1960)
4. William F. Lewis (1960–1964)
5. Ivol Ira Curtis (1964–1976)
6. Robert H. Cochrane (1976–1989)
7. Vincent Waydell Warner, Jr. (1990–2007)
   • Sanford Zangwill Kaye Hampton, assisting bishop
   • Bavi Edna Rivera, bishop suffragan (2006–2009)
8. Gregory Rickel (2007–2022)
   • Melissa M. Skelton, bishop provisional (2023–2024)
9. Philip N. LaBelle (2024-present)

The Diocese owns a summer camp located in Gold Bar, WA next to the Wallace Falls State Park. Director Bill Tubbs for the last 20 years has overseen operation of both the Conference and Summer Camp seasons.

• List of Succession of Bishops for the Episcopal Church, USA

• Official Web site of the Episcopal Church
• Episcopal Diocese of Olympia website
• St. Mark's Episcopal Cathedral
• Huston Camp and Conference Center website

47°36′N 122°20′W / 47.600°N 122.333°W / 47.600; -122.333