The Nissan RD engine series is basically a Nissan RB engine design, except that it is only a single overhead cam six-cylinder diesel engine.

Suzanne RD Tata (nee Brière, 1880–1923), also known as Sooni Ratanji Dadabhoy Tata, was the French wife of Indian businessman Ratanji Dadabhoy Tata.

RD Saúde (or Raia Drogasil) is the largest drugstore company in Latin America by revenue and market capitalization.