Andijan Region is a region of Uzbekistan, located in the eastern part of the Fergana Valley in far eastern Uzbekistan. It borders with Kyrgyzstan, Fergana Region and Namangan Region. It covers an area of 4,300 km2. The population is estimated to be around 3,253,528 (2022) thus making Andijan Region the most densely populated region of Uzbekistan.

Osh Region is a region (oblast) of Kyrgyzstan. Its capital is Osh, which is not part of the region. It is bounded by (clockwise) Jalal-Abad Region, Naryn Region, China (Xinjiang), Tajikistan, Batken Region, and Uzbekistan. Its total area is 28,934 km2 (11,171 sq mi). The resident population of the region was 1,391,649 as of January 2021. The region has a sizeable Uzbek minority.