The 2012 Slovak Open was a professional tennis tournament played on indoor hard courts. It was the 13th edition of the tournament which was part of the 2012 ATP Challenger Tour. It took place in Bratislava, Slovakia between 5 and 11 November 2012.
Singles main-draw entrants
Seeds
| Country | Player | Rank1 | Seed |
|---|---|---|---|
 SVK |
Lukáš Lacko | 53 | 1 |
 CRO |
Ivan Dodig | 67 | 2 |
 GER |
Björn Phau | 83 | 3 |
 CZE |
Lukáš Rosol | 85 | 4 |
 UKR |
Sergiy Stakhovsky | 89 | 5 |
 LTU |
Ričardas Berankis | 96 | 6 |
 BEL |
Olivier Rochus | 97 | 7 |
| CRO |
Ivo Karlović | 103 | 8 |
- 1 Rankings are as of October 29, 2012.
Other entrants
The following players received wildcards into the singles main draw:
- Norbert Gomboš
- Filip Horanský
- Jozef Kovalík
- Kamil Čapkovič
The following players received entry as an alternate into the singles main draw:
The following players received entry from the qualifying draw:
Champions
Singles
- Lukáš Rosol swd. Björn Phau, 6–7(3–7), 7–6(7–5), 7–5(8–6)
Doubles
- Lukáš Dlouhý /
Mikhail Elgin def. Philipp Marx / 
Florin Mergea, 6–7(5–7), 6–2, [10–6]