This is the website for the Combinatorics RTG at the University of Illinois at Urbana-Champaign (UIUC), funded by NSF RTG grant DMS 1937241 (2020-2025). UIUC represents a broad spectrum of combinatorics research (see the RTG faculty and their interests). The training grant funds numerous activities in combinatorics, including multiple seminars, visitors, undergraduate research (through the ICLUE program), graduate research, and postdocs.