According to the Times Higher Education World University Rankings, UIUC is ranked as the 36th best university in the world and the 21st best university in the US (in the BIG, we are behind Northwestern and Michigan).
https://www.timeshighereducation.com/world-university-rankings/2017/world-ranking#!/page/1/length/25/sort_by/rank/sort_order/asc/cols/stats
In the Academic Ranking of World Universities, UICU is ranked 30th globally, and 23rd nationally.
http://www.shanghairanking.com/ARWU2016.html
https://www.timeshighereducation.com/world-university-rankings/2017/world-ranking#!/page/1/length/25/sort_by/rank/sort_order/asc/cols/stats
In the Academic Ranking of World Universities, UICU is ranked 30th globally, and 23rd nationally.
http://www.shanghairanking.com/ARWU2016.html