| Name | Ordination Date | Credentials |
|---|---|---|
| Jong-Bam Oh | March 4, 2013 | |
| Insoo Oh | April 23, 2022 | Namu Church of New York Classis Hudson |
| JongPil Oh | September 30, 2008 | |
| Peter H. Oh | October 4, 2008 | San Jose New Hope CRC Classis Central California |
| Eun Suk Oh | January 14, 2023 | New Westminster CRC Classis B.C. North-West |
| John S. Oh | October 21, 1998 | Korean-American CRC of Orange County Classis California South |
| Sang Kyu Oh | September 13, 2014 | Abundant Life Korean Church Classis Hanmi |
| Jin Hwan H. Oh | September 15, 1997 | |
| Eddy A. Olguin | September 30, 2003 | Covenant CRC Classis Iakota |
| Benjamin M. Oliveira | October 9, 2008 | First Christian Reformed Church Classis Muskegon |
| Katrina J. Olson | October 30, 2021 | |
| Zachary J. Olson | November 19, 2009 | Sunlight Ministries Classis Southeast U.S. |
| Petrus L. 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 |
| Jeremy Oosterhouse | March 20, 2021 | Bethel CRC Classis Illiana |
| Jessica J. Oosterhouse | November 24, 2012 | |
| 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 | Madison Avenue CRC Classis Hackensack |
| 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 |
| John M. Ouwinga | September 21, 1974 | Moline CRC Classis Grand Rapids South |
| Timothy J. Ouwinga | September 14, 1981 | Faith CRC Classis Iakota |
| 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 | |
| Dominic J. Palacios | October 4, 2008 | |
| Kristin E. Palacios | October 9, 2010 | |
| 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 L. 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 |
| Byoung Eun Park | November 6, 1999 | |
| Jang Ho Park | June 26, 1999 | Tacoma CRC Classis Pacific Northwest |
| Jun (Mark) Y. Park | May 18, 2024 | Global Vision CRC Classis Hudson |
| DaeWoo Park | May 31, 2004 | Areumdawoon Church of Las Vegas Classis California South |
| Kyung Ho Park | November 28, 2009 | Yeolin Community Church Classis Ko-Am |
| Tong Kun Park | February 14, 1997 | Orange Korean CRC Classis Ko-Am |