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- R & B, R & B Aircraft Company - United States
- RACA, Representaciones Aero Comerciales Argentinas SA - Argentina
- Radab, AB Radab - Sweden
- RAF (1), Royal Aircraft Factory - United Kingdom, > Royal Aircraft Establishment
- Ragwing, RagWing Aircraft Designs - United States
- Rainbow, Rainbow Aircraft (Pty), Ltd. - South Africa
- Rand, Kenneth Rand - United States
- Rand, Rand Robinson Engineering, Inc. - United States
- Ranger Aircraft Corp. - United States (1929, Oklahoma City OK, upon acquiring design and production rights of Coffman Monoplanes Inc.)
- Rans, Rans, Inc. - United States (Randy Schlitter, Hays KS) kit-built small aircraft
- Ravin, SA Ravin Composite Aircraft Manufacturers - South Africa
- Raytheon, Raytheon Aircraft Company - United States
- Raytheon, Raytheon Corporate Jets, Inc. - United Kingdom
- Rearwin, Rearwin Aircraft & Engines, Inc. - United States
- Rearwin, Rearwin Airplanes, Inc. - United States
- Reda, Reda-MDT, Ltd. - Russia
- Redfern, Walter Redfern Company - United States
- Reflex, Reflex Fiberglass Works, Inc. - United States
- Regy Freres, Regy Freres - France
- Reims, Reims Aviation SA - France
- Renaissance (1), Renaissance Composites, Inc. - United States
- Renaissance (2), Renaissance Aircraft LLC - United States
- Renard, Robert Renard - France
- Renard, George & Alfred Renard
- Replica Plans, Replica Plans - Canada
- Republic, Republic Aviation Corporation - United States, (1939-?)
- Revolution, Revolution Helicopter Corporation, Inc. - United States
- Rhein, Rhein-Flugzeugbau GmbH - Germany, (RFB)
- Rhein-West-Flug, Rhein-West-Flug Fischer und Companie - Germany
- Rihn, Dan Rihn - United States
- Rihn, Rihn Aircraft Corporation - United States
- Rikugun, Rikugun Kokugijutsu Kenkyujo - Japan, (Army Aerotechnical Research Institute)
- Riley, Riley Aeronautics Corporation - United States, (?-1983) > Advanced Aircraft Corp
- Riley, Riley Aircraft Corporation - United States
- Riley, Riley Aircraft Manufacturing, Inc. - United States
- Riley, Riley International Corporation - United States
- Riley, Riley Turbostream Corporation - United States
- RLU, Charles B. Roloff, Robert Liposky and Carl Unger - United States
- Robin, Avions Pierre Robin - France, (1969-present)
- Robin, Avions Pierre Robin, Inc. - Canada
- Robin, Robin Aviation - France
- Robinson, Robinson Helicopter Company - United States
- Rock, J. Rock Segelflugzeugbau - Germany
- Rocket, Rocket Aircraft Company - United States
- Rockwell, Rockwell International Corporation - United States, (1966-1996) > Boeing North American
- Rockwell-MBB, see ROCKWELL and MBB - United States/Germany
- Rogerson Hiller, Rogerson Hiller Corporation - United States
- Rogozarski, P. S. F. A. -Rogozarski - Yugoslavia, (1924-1941) (First Serbian Aircraft Factory-Rogozarski)
- Rolladen-Schneider, Rolladen-Schneider Flugzeugbau GmbH - Germany
- Rollason, Rollason Aircraft and Engines, Ltd. - United Kingdom
- Romaero, SC Romaero SA - Romania
- Rose, Rose Aeroplane and Motor Company - United States
- Rotary Air Force, Rotary Air Force, Inc. - Canada
- Rotec, Rotec Engineering, Inc. - United States
- Rotorway, Rotorway Aircraft, Inc. - United States
- Rotorway, Rotorway International - United States
- Rouchaud, F. Rouchaud, Construction Aéronautique - France
- Rousseau, Etablissements Rousseau Aéronautique - France
- RTAF, Royal Thai Air Force - Thailand
- RUAG, RUAG Aerospace - Switzerland
- Rumpler, Edmund Rumpler - Austria, (Rumpler Flugzeugwerke GmbH)
- Rupert, Charles Rupert Joses - Brazil
- Ruschmeyer, Ruschmeyer Luftfahrttechnik GmbH - Germany
- Rusjan Brothers, Rusjan Brothers - Austro-Hungarian Empire, (Edvard & Josiph (Jože) Rusjan)
- Rutan, Rutan Aircraft Factory - United States, (Scaled Composites)
- RWD, Rogalski, Wigura and Drzewiecki - Poland
- Ryan, Ryan Aeronautical Company - United States
Read more about this topic: List Of Aircraft Manufacturers Q-S