The Illinois Office of Tourism (IOT) is a state agency that promotes Illinois as a leading travel destination for leisure travelers, meetings, conventions, and special events. It works to generate economic growth and improve the quality of life for residents by attracting visitors from both domestic and international markets. The IOT collaborates with numerous certified Convention and Visitor Bureaus (CVBs) across the state to showcase Illinois' diverse attractions.

The office manages significant tourism initiatives that welcome over 111 million visitors each year, contributing billions to the economy and supporting hundreds of thousands of jobs. It administers grant programs to enhance tourism development and marketing efforts. The IOT markets Illinois through various media campaigns, including the Enjoy Illinois brand, which features a comprehensive travel website and seasonal travel magazines. Additionally, it runs programs like Illinois Made to promote local products and crafts, and it provides resources and support to local tourism organizations through grant funding and recognition initiatives.