Syumsinsky District (Russian: Сюмси́нский райо́н; Udmurt: Сюмси ёрос, Sjumsi joros) is an administrative[1] and municipal[6] 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 1,789.7 kilometers (1,112.1 mi).

[3] Its administrative center is the rural locality (a selo) of Syumsi.

[9] The population of Syumsi accounts for 39.7% of the district's total population.