• Random South Player, a group of Magic: The Gathering players from the region of Andalucía, Spain, known for their cheating skills.
• Reality signal processor, a component of the Nintendo 64
• Rail Settlement Plan, provider of revenue allocation and support services to Britain's Train Operating Companies
• Rail Sim Pro, a rail simulator by Auran Software
• Rana Sura Padakkama, a military decoration of Sri Lanka
• RSP (band), a Japanese hip-hop and R&B group
• Recruit Sustainment Program
• Remote Serial Port, an extension to the [protocol]
• Recommended Selling Price
• Retirement Savings Plan
• Repositories Support Project, a project that supports development of UK based repositories
• Resource Specialist Program, a category of special education program in some US schools
• Respirable Suspended Particle
• Restricted Stock Partners, a broker-dealer specializing in illiquid securities
• Revolutionary Socialist Party

Companies:

• Rising Sun Pictures, an Australian visual effects service provider
• Rogers Sportsnet Pacific

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