Butler Blue IV, the current iteration of Butler Blue, is the Official Mascot of Butler University. Blue is a red fawn and white, male, AKC-registered English Bulldog and can be easily recognised by the marking above his right eyebrow. There have been four bulldogs to bear the name, with the most recent, who assumed the name in January 2020, taking over as mascot in the 2020–21 school year.

Butler University is a private university in Indianapolis, Indiana. Founded in 1855 and named after founder Ovid Butler, the university has over 60 major academic fields of study in six colleges: the Lacy School of Business, College of Communication, College of Education, College of Liberal Arts and Sciences, College of Pharmacy and Health Sciences, and Jordan College of the Arts. Its 295-acre (119 ha) campus is approximately five miles (8.0 km) from downtown Indianapolis.