The finalists are Omnicom Group's GSDM, Austin, Texas Interpublic Group of Cos.' Deutsch, New York; and Wieden & Kennedy, New York.
A 7-Eleven spokeswoman declined to discuss the short list and said a decision would be made at the beginning of next year.
"We are not going to reveal any [agency] until the announcement" of a winner, she said.
The review started with six shops. The Richards Group, Dallas, was the previous agency.
Last year, 7-Eleven spent $20.7 million on advertising, according to Taylor Nelson Sofres' CMR.