IEEEXtreme is an annual global programming competition that attracts more than four thousand teams worldwide. IEEEXtreme 15.0 will take place in October, 2021. The contest seeks original and inspirational ideas for programming challenges. If you are interested in contributing a problem to IEEEXtreme 15.0, please read below for how to proceed. This Call for Problems is open to anyone, except the competitors who will compete in IEEEXtreme 15.0. Please feel free to forward this to anyone who may be interested.