RF
- Rf – (s) Rutherfordium
- RF – (i) Radio Frequency – Receptive Field (neurophysiology)
- RFA – (i) Restrictive Fire Area (military) – Royal Field Artillery
- RFC – (i) Request for Comments – Royal Flying Corps (WWI precursor to RAF)
- RFD - (a) Request for Documentation
- RFE – (i)
- RFEF – (i) Real Federación Española de Fútbol (Spanish for Royal Spanish Football Federation)
- RFF – (i) Right of First Refusal (legal term)
- RFI – (i) Ready For Inspection – Ready For Issue – Request For Information – Radio Frequency Interference
- RFID – (p) Radio Frequency IDentification
- RFL – (i) Rugby Football League
- RFL – (i) Restrictive Fire Line (military)
- RFP - (a) Request for Proposal
- RFQ - (a) Request for Quotation
- RFT - (a) Request for Tender
- RFU – (i) Rugby Football Union
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