The Reasoning UKM is a student activity unit engaged in scientific and non-scientific research. This Reasoning UKM can become a forum for students to develop a mindset systematically related to their interest in scientific and social matters on campus and in the community. The Reasoning UKM carries out many activities related to research, scientific writing, and creates innovative products. Reasoning UKM in Telkom University, namely:
- Journalistic Script
- Central Computer Improvement (CCI)
- Indonesian Higher Education Young Entrepreneurs Association (HIPMI PT)
- Indonesia Marketing Association Student Chapter (IMA SC)
- Institute of Electrical and Electronics Engineers (IEEE)
- TelU Student Cooperative (KOPMA)
- Student Activity for Research and Competition Handling (SEARCH)
- Student English Society (SES)