The 1938 season of the Primera División Peruana, the top category of Peruvian football, was played by 9 teams. The national champions were Municipal. Because Alianza Lima and Mariscal Sucre tied on points a relegation playoff took place. From 1931 until 1942 the points system was W:3, D:2, L:1, walk-over:0.
1938 National Champions - 1st title
References
1938 Peruvian Primera División Wikipedia(Text) CC BY-SA