| Name | Ordination Date | Credentials |
|---|---|---|
| Insoo Oh | April 23, 2022 | Namu Church of New York Classis Hudson |
| Eddy A. Olguin | September 30, 2003 | Amistad Cristiana CRC Classis Iakota |
| Benjamin M. Oliveira | October 9, 2008 | First Christian Reformed Church Classis Muskegon |
| Zachary J. Olson | November 19, 2009 | Sunlight Ministries Classis Southeast U.S. |
| Katrina J. Olson | October 30, 2021 | |
| Petrus Onggomuljono | November 8, 2003 | Immanuel CRC Classis B.C. North-West |
| John A. Ooms | September 23, 1981 | Inglewood CRC Classis Alberta North |
| Matthew D. Ooms | November 11, 2001 | Madison Square CRC Classis Grand Rapids East |
| Wybren H. Oord | October 4, 1986 | |
| Derk Oostendorp | January 18, 1968 | Plymouth Heights CRC Classis Grand Rapids East |
| Jessica J. Oosterhouse | November 24, 2012 | |
| Jeremy Oosterhouse | March 20, 2021 | Bethel CRC Classis Illiana |
| Thomas J. Oosterhuis | January 22, 1976 | West End CRC Classis Alberta North |
| Gerald Oosterveen | September 29, 1966 | |
| Donald R. Orange | May 26, 2018 | Immanuel Christian Reformed Church Classis Rocky Mountain |
| Ricardo E. Orellana | December 9, 1994 | The Journey Classis Rocky Mountain |
| Hector Raul Orlandi | August 31, 2003 | Iglesia Cristiana Reformada Vida Nueva CRC Classis Southeast U.S. |
| Ramon L. Orostizaga | September 21, 2002 | |
| Guillermo Ortiz | May 6, 1991 | |
| James D. Osterhouse | September 30, 1971 | Calvary CRC Classis Holland |
| Rudy W. Ouwehand | September 27, 1979 | Trinity CRC Classis B.C. South-East |
| Timothy J. Ouwinga | September 14, 1981 | Faith CRC Classis Iakota |
| John M. Ouwinga | September 21, 1974 | Moline CRC Classis Grand Rapids South |
| Cornelius C. Overduin | September 26, 1985 | |
| Timothy Overweg | November 27, 1993 | |
| Jonathan S. Owens | September 8, 2018 | |
| Cornelis Padmos | December 31, 1955 | |
| Peter Sangho S. Pae | August 31, 2006 | |
| Noah Paek | January 20, 1996 | |
| Kristin E. Palacios | October 9, 2010 | |
| Dominic J. Palacios | October 4, 2008 | |
| Roy Palavicini | March 26, 2005 | |
| Robert J. Palma | December 31, 1959 | |
| Jesse M. Pals | October 22, 2016 | The Tapestry Classis B.C. North-West |
| Russell Palsrok | October 14, 1972 | LaGrave Avenue CRC Classis Grand Rapids South |
| Matthew A. Palsrok | September 21, 1985 | Cottonwood Church Classis Georgetown |
| Sang (Sam) Yong Pang | February 25, 2019 | Cerritos Mission Church Classis Greater Los Angeles |
| John JungUn Park | March 6, 2010 | Han-Bit Korean CRC Classis Lake Erie |
| Paul ChulHong Park | March 20, 2004 | |
| Jang Ho Park | June 26, 1999 | Tacoma CRC Classis Pacific Northwest |
| Suh Hyun Park | September 15, 2003 | |
| Hyung Ju Park | February 13, 1993 | Lifestream CRC Classis Hanmi |
| Gui Je Park | September 19, 1997 | Mill Creek Church Classis Pacific Northwest |
| Kyung Ho Park | November 28, 2009 | Yeolin Community Church Classis Ko-Am |
| Tong Kun Park | February 14, 1997 | Orange Korean CRC Classis California South |
| Sang Jung Park | September 24, 2016 | Dallas Woori Reformed Church Classis Hanmi |
| Seonghwan Park | July 9, 1994 | |
| Amos S. Park | August 31, 2003 | All Nations Church Classis Greater Los Angeles |
| DaeWoo Park | May 31, 2004 | Areumdawoon Church of Las Vegas Classis California South |
| SungJae Park | June 30, 2007 | Kent First Korean CRC Classis Pacific Northwest |