Purpose - To provide an overview of how corporate sponsorships can be successfully used by libraries. Design/methodology/approach - Using successful examples from St Louis Public Library, the topic of corporate sponsorships and their value to libraries is presented. Findings - Corporate sponsorship of services and events can be a valuable source of support for libraries. However, it is important to accurately determine what project costs are, and what the value of the partnership is for the corporation. Originality/value - Not everyone agrees that corporate sponsorships are a good idea for libraries, but getting involved in them does not mean that you have to compromise the library's mission. With proper planning and partnering, a win-win outcome is possible.