Ants are ubiquitous in distribution and being one of the important detritivores, they play a significant role in balancing the ecosystem. Some of them are ground dwellers and few are arboreal in habitat. Tumakuru one of the districts in Karnataka is rich in floral and faunal diversity. However, there is lacuna in the documentation of biological and ecological aspects of ant fauna. This study aims at recording diversity ofant species by adapting all-out-search method from January 2019 to April-2019 at Tumkur University Campus, Tumakuru. During survey five different subfamilies namely Formicinae, Myrmicinae, Ponerinae, Dolichoderinae and Pseudomyrmicinae with 28 ant species belonging to 17 Genera were recorded from our study area. The subfamily Myrmecinae was shown to be more dominant and diversified with 6 genera and 13 species (46%). The second most diversified subfamily was Formicinae which includes 6 genera and 10 (36%) species.Least diversified subfamily is Pseudomyrmecinae with 1 generic species. The study area has recorded high species diversity richness value. From the present study it is evident that different types of habitats and ecological factors of the campus are favourable for the wide diversity of ant species. The present data forms base line information for conducting future research in the ant biology exclusive to Tumakuru district.