| Date: | 2–8 January |
| Edition: | 17th |
| Category: | 250 series |
| Draw: | 32S / 16D |
| Prize Money: | $398,250 |
| Surface: | Hard / outdoor |
| Location: | Chennai, India |
| Venue: | SDAT Tennis Stadium |
| Champs: |  Milos Raonic[1] |
| Champd: |  Leander Paes /  Janko Tipsarević[2] |
The 2012 Aircel Chennai Open was a 2012 ATP World Tour tennis tournament, played on outdoor hard courts. It was the 17th edition of the only ATP tournament taking place in India and took place at the SDAT Tennis Stadium in Chennai, India. It was held from 2 to 8 January 2012. 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.[3] Finally, fourth seed Milos Raonic from Canada defeated world no. 9 and top seeded Serb Janko Tipsarević to win only his second ATP title.[4] Raonic became the first player since Roger Federer in 2008 to win an ATP title without losing a serve. The doubles title went to the Indo-Serb pair of Leander Paes and Janko Tipsarević after they defeated the Israeli pair of Jonathan Erlich and Andy Ram.[5]
See main article: 2012 Aircel Chennai Open – Singles. Milos Raonic defeated Janko Tipsarević, 6–7(4–7), 7–6(7–4), 7–6(7–4)
See main article: 2012 Aircel Chennai Open – Doubles. Leander Paes / Janko Tipsarević defeated 
Jonathan Erlich / Andy Ram, 6–4, 6–4
| width=70 | Country | width=175 | Player | Rank | Seed |
|---|---|---|---|---|---|
| Serbia | Janko Tipsarević | 9 | 1 | ||
 Spain | Nicolás Almagro | 10 | 2 | ||
| Stanislas Wawrinka | 17 | 3 | |||
| Canada | Milos Raonic | 31 | 4 | ||
| Ivan Dodig | 36 | 5 | |||
 Italy | Fabio Fognini | 48 | 6 | ||
 Belgium | Xavier Malisse | 49 | 7 | ||
| Belgium | Olivier Rochus | 67 | 8 |
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:
Somdev Devvarman (right shoulder injury) Steve Darcis (right shoulder injury)| Country | Player | Country | Player | Rank1 | Seed | |
|---|---|---|---|---|---|---|
| India | Mahesh Bhupathi | India | Rohan Bopanna | 18 | 1 | |
| Scott Lipsky | Rajeev Ram | 74 | 2 | |||
| India | Leander Paes | Janko Tipsarević | 93 | 3 | ||
| Israel | Jonathan Erlich | Andy Ram | 101 | 4 |
The following pairs received wildcards into the doubles main draw:
The following pair received entry as alternates:
Somdev Devvarman (right shoulder injury)
