Syumsinsky District (; , Sjumsi joros) is an administrative and municipal district (raion), one of the twenty-five in the Udmurt Republic, Russia. It is located in the west of the republic. The area of the district is . Its administrative center is the rural locality (a selo) of Syumsi. Population: 16,288 (2002 Census); The population of Syumsi accounts for 39.7% of the district's total population.