SEMPO (Search Engine Marketing Professional Organization) is a non-profit association made up of some 290 members, including SEM companies, advertising agencies, and consultants; services and product providers; and Fortune 500 companies with in-house SEM staff. SEMPO's mission is to increase awareness and promote the value of search engine marketing to businesses worldwide.

The organization is sponsored by several companies in the search engine advertising world, including Overture, Verizon SuperPages, Google, Atlas OnePoint and JupiterMedia.

SEMPO is committed to providing current, relevant SEM information to the marketing community, primarily through the SEMPO website (www.sempo.org) and informational meetings worldwide. SEMPO.org is a comprehensive resource for industry research and articles written specifically to educate online business managers and marketers on the value of SEM. The organization provides many benefits to members and their clients and potential clients including case studies, requests for SEM services from the public, and a place to post open positions within their company.

SEMPO continues to expand globally with the recent formation of SEMPO Europe and SEMPO Japan.