B2B

B2B, B to B, or B-to-B may refer to:

Sports

 * B2B, a controversial and short lived class in the 1979 Sidecar World Championship
 * Bay to Breakers, an annual footrace in San Francisco, California on the third Sunday of May
 * Budapest-Bamako, now the largest amateur rally in the world, the largest rally across the Sahara and an important charity car race in Africa
 * Box-to-box, central midfielders who are skilled at both defending and attacking

Other uses

 * BtoB (band), a South Korean boy group
 * Business-to-business, commerce transactions between businesses, such as between a manufacturer and a wholesaler, or between a wholesaler and a retailer
 * Bean-to-bar, a marketing term for chocolate production
 * "B2B", a 2024 song by Charli XCX from the album Brat