Some of the prominent alumni of Thiagarajar College of engineering are as follows.

• A.Sivathanu Pillai- He is a Padma Bhusan recipient, a friend of Dr APJ Abdul Kalam, former vice president of the International project management association, and co-author of several books as well. He is also known as the Father of BRAHMOS.
• Meerah Rajavel- She is the Senior Director, IT Solution Delivery & Cloud Services, McAfee / Intel Security. She has been enlisted as Women of Influence in 2014 by Silicon Valley business journal.
• Srinivasan Thiagarajan- He is assistant Vice President at Cognizant Technology Solutions.
• Mariappan.M- He is currently heading the position of president in Marketing for Tyco Sanmar Limited & Xomox Sanmar Limited.
• Sashi Rajamani- He is the Head of Grants Committee at Social Venture Partners, India
• Gnanapriya. C- He is the head architect at Infosys.
• Prabha Ramaraj- He is the Leader - Commercialization & New Product Launches at 3M.
• Karthick Subbaraj- He is a renownedKollywood director.
• Nagendran Sundararajan- He is an Executive Vice President at MeritTrac - Manipal Education Group.

Apart from the above-mentioned ones, there are many other well-known alumni of Thiagarajar College of Engineering.