B
- Bangladesh Caucus (2002-)
- Bike Caucus AKA Bicycle Caucus
- Biomedical Research Caucus
- Bipartisan Disabilities Caucus (2006(?)–)
- Bipartisan Working Group on Disaster Recovery and Response, The (2006(?)–)
- Blue Dog Coalition (1994–)
- Congressional Bourbon Caucus (2009–present), founded by Brett Guthrie and John Yarmuth
- Building a Better America Caucus (BABC) (2006(?)–)
Read more about this topic: Caucuses Of The United States Congress