- PERC (Tetrachloroethylene)
- PERCS (Program to Enhance Relational and Communication Skills)
- PERDC (Perforation Depth Control)
- PERDDIMS (Personnel Deployment and Distribution Management Systems)
- PERE (Person Eligible to Receive Effects)
- PERF (Perfection)
- PERFO (Perforation Log)
- PERI (Pharmaceutical Education and Research Institute)
- PERID (Period)
- PERISCOPE (United States Ship)
- PERK (Positive Energy Rejuvenates Kin)
- perl (usually lower case Practical Extraction and Report Language)
- PERM (Permeability)
- PERMARS (Personnel Management Reports System)
- PERML (Permeability Log)
- PERMREP (Permanent Representative (NATO))
- PERMS (Personnel Electronic Records Management System)
- PERN (Preliminary Engineering Release Notice)
- PERP (Perpetrator)
- Perpes (Humorous nickname for PRP, take on herpes)
- PERR (Preliminary Engineering Research Report)
- PERRLA (Pupils equal, round, reactive to light and accommodation)
- PERRMS (PERsonnel Resource Management System)
- PERS (Personal Emergency Response System)
- PERSACS (Personnel Structure and Composition System)
- PERSCO (Personnel Support For Contingency Operations)
- PERSCOM (PERSonnel COMmand)
- PERS DET (Personnel Detachment)
- PERSIB (Persatuan Sepak Bola Indonesia Bandung)
- PERSINS (Personnel Information System)
- PERSISTA (Political, Economic, Religious, Social, Intellectual, Scientific, Technological, Artistic)
- PERSITREP (PERSonnel SITuation REPort)