René Lorin (24 March 1877 – 16 January 1933) was a French aerospace engineer and the inventor of the ramjet.

In 1908, Lorin patented (FR390256) the first subsonic ramjet design. From 1908 to 1913, he wrote articles in the journal L'Aérophile explaining how exhaust from internal combustion engines could be directed into nozzles to create jet propulsion. At the time, there was no way to test this invention because aircraft could not travel fast enough for a ramjet to function properly.

In 1933, René Leduc applied for a patent (FR705648) for a ramjet design. He discovered Lorin’s earlier publications and tried to contact him but learned that Lorin had recently died. Leduc later honored Lorin’s work.

René Lorin graduated from the École Centrale Paris.