The 2012 Aircel Chennai Open was a 2012 ATP World Tour tennis tournament, played on outdoor hard courts.

Stanislas Wawrinka was the defending singles champion coming into the tournament but was knocked out in the quarterfinals.

Former champion Marin Čilić was originally in the field as the 4th seed before pulling out with a patellar tendon injury.

[4] Raonic became the first player since Roger Federer in 2008 to win an ATP title without losing a serve.

[5] Milos Raonic defeated Janko Tipsarević, 6–7(4–7), 7–6(7–4), 7–6(7–4) Leander Paes / Janko Tipsarević defeated Jonathan Erlich / Andy Ram, 6–4, 6–4 The following players have been announced as part of the singles main draw: Wild Cards The following players received entry from the qualifying draw: The following player received entry as Lucky loser: The following pairs received wildcards into the doubles main draw: The following pair received entry as alternates: