Raja Permaisuri Tuanku Bainun, Sultan Azlan Muhibbuddin Shah's widow Raja Ja'afar ibni Almarhum Raja Muda Musa (Jawi: راج جعفر ابن المرحوم راج مودا موسى; born 26 September 1941) is the Raja Muda (Crown Prince) of Perak Darul Ridzuan since 20 June 2014.

He had his early education at Anderson School, Ipoh and Anglo-Chinese School, Teluk Intan before studying for his bachelor's degree at Universiti Malaya and then his master's degree in Public Administration at Cornell University, United States.

Raja Ja'afar has a wide experience in public administration.

He joined Perak State Secretariat in 1966, served in the District & Land Office from 1966 to 1971.

He became an under-secretary at the Higher Education Division of the Education Ministry from 1979 to 1984, and then secretary of the Foreign Investment Committee at the Economic Planning Unit and deputy secretary-general (Development and Finance) of the Defence Ministry before finally retiring from government service in 1996.