| R. | Rabbi; Reaumur; response; restaurant car available; retard (clock) Rex or Regina (Latin) King or Queen; right river; road; Roman rupee. |
| r. | Radius; rare; residence rises; rod(-s) (measure) rood(-s); runs (cricket). |
| R.A. | Right ascension. |
| Rad. | Radical. |
| rad. | Radius. |
| rail. | Rallentando (Italian), becoming slower. |
| R.C. | Red Cross; Regional Commissioner; right of centre (stage); Roman Catholic. |
| R.C.M.P. | Royal Canadian Mounted Police. |
| rcpt. | Receipt. |
| Rd. | Road. |
| R.D. | Research department; Rural Dean. |
| R/D. | Return to drawer (banking). |
| Rec. | Record(-er); recreation ground. |
| rec. | Receipt; received; reception room; recipe. |
| rect. | Receipt; rectangle; rectified. |
| Red. | Redeemable. |
| red. | Reduced. |
| ref. | Referee; reference; referred; reformed; with reference to. |
| refl. | Reflexive. |
| Reg. | Regent; region(-al); registrar; regulation. |
| reg. | Register(-ed); regular(-ly). |
| rel. | Related; relative; religion. |
| rem. | Remarks. |
| Ren. | Renaissance. |
| Rep. | Repertory company; Representative; Republic(-an). |
| rep. | Repeat; repetition; repetiteur (orchestral); report(-er); represent(-ing); reprimand. |
| repr. | Representing; reprinted; reproduced. |
| res. | Reserve(-d); residence; resigned. |
| resp. | Respective(-ly); respondent. |
| rest. | Restored. |
| ret(-d). | Retire(-d); return (-ed). |
| Rev. | Revelation of S. John; Revenue; Reverend; Revolution (political). |
| rev. | Reverse(-d); revised; revolution (mechanical). |
| R.F. | Representative fraction; Republique francaise (French Republic). |
| R.H. | Right hand. |
| Rho(d). | Rhodesia. |
| R.I. | Rhode Island. |
| R.I.C. | Royal Irish Constabulary. |
| R.I.P. | Requiescat in pace (Latin), may he rest in peace. |
| rit. | Ritardando, ritenente, ritenuto (Italian), becoming slower. |
| R.K.O. | Radio - Keith - Or -pheum. |
| R.L.O. | Railway liaison officer. |
| R.L.S. | Robert Louis Stevenson. |
| rly. | Railway. |
| Rm. | Reichsmark(-s). |
| R.M. | Resident magistrate; Royal Mail. |
| rm. | Ream; room. |
| R.M.O. | Resident Medical Officer. |
| R.M.S. | Royal mail steamer. |
| R.M.S.P. | Royal Mail Steam Packet Company. |
| R.O. | Receiving officer; receiving order; recruiting officer; relieving officer; returning officer. |
| ro. | Recto (Latin), on the right-hand page; road; rood. |
| r.o. | Run on (type); run out (cricket). |
| Roffen | Roffemis (Latin), of Rochester (Bp.'s signature). |
| Rom. | Epistle to the Romans; Roman. |
| rom. | Roman (type). |
| R.P. | Reply paid; reprint; rules of procedure. |
| rpt. | Repeat; report. |
| rr. | Rarissime (Latin), very rarely; rear. |
| Rs. | Rupees. |
| R.S.C. | Rules of the Supreme Court. |
| R.S.F.S.R. | Russian Soviet Federated Socialist Republic. |
| R.S.O. | Railway sorting office; railway sub-office. |
| R.S.V.P. | Repondez s'il vous plait (French), answer, if you please. |
| Rt. | Right. |
| R.T. | Radio telephony; received text. |
| R.U.E. | Right upper entrance. |
| R.V. | Rendezvous; Revised Version. |
| RX. | Rix dollar; tens of rupees. |
| R.Y.S. | Royal Yacht Squadron. |