Siddeley Engines was a British company known for manufacturing aircraft engines during the early to mid-20th century. Founded in 1908, it played a significant role in the development of aviation technology, producing engines for various military and civilian aircraft. The company became part of the larger Rolls-Royce group in 1966, further enhancing its reputation in the aerospace industry. The engines produced by Siddeley were recognized for their innovation and reliability. Notable models included the Siddeley Tiger and the Siddeley Viper, which powered several aircraft types. The company's contributions helped shape the future of aviation and laid the groundwork for modern engine design.