• "Rest in peace" (from Latin requiescat in pace), a prayer which typically appears on tombstones
• Regulation of Investigatory Powers Act 2000, a UK act of Parliament
• Ranger Indoctrination Program, a U.S. Army program required for enlisted personnel prior to assignment to a Ranger battalion
• Royal Institute of Philosophy, a UK institution
• R.I.P. cartridge (Round Irritant Personnel), specialist shotgun ammunition

Biology:

• Regulated intramembrane proteolysis, a biochemical process
• Ribosome inhibiting protein, in molecular biology

Technology:

• Routing Information Protocol, a routing protocol used in computer networks
• Raster image processor, a component used in a printing system which produces a bitmap
• Recovery Is Possible, a Linux distribution
• Register instruction pointer, in the x64 instruction sets
• Row Instruction pointer, a special purpose register in network processors
• Remote imaging protocol or "RIPscrip", a method of using graphics instead of text on a BBS
• Repeat induced point-mutation

Music:

• R.I.P. (Rock in Peace), a rare AC/DC song from 1976
• Rust in Peace, fourth studio album by Megadeth
• R.I.P. (album), an album by thrash metal band Coroner

See also

• Rip current - a strong surface flow of water returning seaward from near the shore