The UPC collective conformance suite is a collection of tests that help determine how closely a given implementation of the UPC collective operations conform to the specifications. The test suite is based on Version 1.1 of the UPC specification and Version~1.0 of the UPC collectives specifications. It has been used on the MuPC and HP UPC platforms. These tests exercise all of the collective operations, with the exception of the deprecated upc_all_sort operation, and notify the tester of behavior that departs from the specifications.