- 4-H Caucus
- Air Force Caucus
- Anti-Value Added Tax Caucus
- Army Caucus
- Victory in Iraq Caucus
- China Caucus
- Community College Caucus
- Congressional Biotechnology Caucus
- Congressional Coalition on Adoption
- Congressional Farmer Cooperative Caucus
- Congressional Immigration Reform Caucus
- Congressional Rural Caucus
- Congressional Sportsmen's Caucus
- Conservative Opportunity Society
- Cuba Democracy Caucus
- Fair Tax Coalition
- House Agriculture Energy Users Caucus
- House Biofuels Caucus
- House Congressional Biotech Caucus
- House Rural Health Care Caucus
- Judicial Accountability Working Group
- Meth Caucus
- Missile Defense Caucus
- National Guard and Reserve Components Caucus
- Pro-Life Caucus
- Pro-Life Working Group
- Republican New Media Caucus
- Republican Study Committee
- Values Action Team
- Victory in Iraq Caucus
- Voters Values Public Affairs Team
