RSP can refer to:
* Red Scarf Penguins
* Rana Sura Padakkama, A military decoration Sri Lanka.
* A Canadian Registered Savings Plan (see RRSP or RESP)
* Revolutionary Socialist Party
* Rail Sim Pro, an in-development Rail Simulator by Auran Software
* Rising Sun Pictures, an Australian visual effects service provider
* Rail Settlement Plan - provider of revenue allocation and support services to Britain's Train Operating Companies
* Registered Retirement Savings Plan
* Rourkela Steel Plant, located in Rourkela, India.
* Remote Service Provider
* R Server Pages
* Red Star Productions, hip hop from the midwest.
* Retail Sales Professionals
* Reality signal processor, a component of the Nintendo 64.
* Roscoe, Snyder and Pacific Railway (AAR reporting marks RSP)
* Rydex S&P Equal Weight stock index
* Recruit Sustainment Program
* Recommended Selling Price
* RSP (band), a popular Japanese hip-h