The Walter Junior was a family of aircraft engines produced by Walter Aircraft Engines in Czechoslovakia in the 1930s, characterised by 115 mm × 140 mm (4.53 in × 5.51 in) bore and stroke. The Junior was also built in Poland as the P.Z. Inż. Junior.
- Forbes, Peter; Forbes, Rita. "Engine Data Sheets:Czechoslovakian Aero Engines: Page 117 of 140". Peter & Rita Forbes' Engine Webpages. Retrieved 20 April 2018.