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

Look up B2B in Wiktionary, the free dictionary.

• 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

• 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

• B2C
• B2G
• Back to Back (disambiguation)
• Back to Basics (disambiguation)
• BOTB (disambiguation)

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