Tajiri (田尻町, Tajiri-chō) is a town located in Sennan District, Osaka Prefecture, Japan.

Osaka Prefecture Tajiri has a Humid subtropical climate (Köppen Cfa) characterized by warm summers and cool winters with light to no snowfall.

The village of Tajiri was established within Hine District of Osaka Prefecture with the creation of the modern municipalities system on April 1, 1889.

Tajiri collectively with the cities of Kaizuka, Sennan, and Hannan contributes two members to the Osaka Prefectural Assembly.

In terms of national politics, the town is part of Osaka 19th district of the lower house of the Diet of Japan.