This report provides information on successful business-to-business marketing techniques with application to transit. The Guidebook provides motivation for doing business-to-business marketing, lessons from the private sector as well as the transit industry, guidance on how to implement a business-to-business marketing program, tools and techniques for business-to-business marketing, and evaluation measures. The report should be useful to transit planners, managers, marketing professionals, and others interested in the use of marketing strategies to build ridership.