*R or R* denote hyperreal numbers.

R* may also refer to:

• R* rule (ecology), or resource-ratio hypothesis, a hypothesis in community ecology
• Rockstar Games, an American video game publisher
• r* or r-star, natural rate of interest
• R*-tree, a tree data structure for spatial access
• Rstar, later called Okina, a sub-satellite of SELENE

• Berkeley r-commands, to enable Unix users to issue commands to another Unix computer via TCP/IP computer network
• Carbon star
• Variable star

This disambiguation page lists articles associated with the title R*.
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