The following locations rent lockers - most charge fees. Call for specific details.
Memorial Library (608) 262-3193 -- Information Desk http://www.library.wisc.edu/memorial/spaces/lockers/
Book lockers in the north and south stacks. Free, with a $10 refundable deposit. There is an online application form here: https://www.library.wisc.edu/memorial/spaces/lockers/locker-application/
Rec Sports (608) 262-3742 -- Division of Recreational Sport Gymnasium-Natatorium
Rents lockers to their clients, generally by the semester at the Natatorium and the Shell (Camp Randall Sports Center), and Nielsen Tennis Stadium. Details (dates, rates, etc.) are available at https://recwell.wisc.edu/memberservices/#lockers
Sett Recreation (608)-263-2514
Bowling Lockers are available for rent on a daily and semester basis. See the Sett Recreation website: https://union.wisc.edu/events-and-activities/climbing-and-bowling/sett-recreation-pricing-and-details/