The 2012 Marburg Open was a professional tennis tournament played on hard courts. It was the third edition of the tournament which was part of the 2012 ATP Challenger Tour. It took place in Marburg, Germany between 25 June and 1 July 2012.
| Country | Player | Rank1 | Seed | |
|---|---|---|---|---|
 Argentina | Horacio Zeballos | 98 | 1 | |
 Spain | Daniel Gimeno Traver | 102 | 2 | |
 Czech Republic | Jan Hájek | 103 | 3 | |
| Aljaž Bedene | 111 | 4 | ||
 Russian Federation | Teymuraz Gabashvili | 147 | 5 | |
 Brazil | Júlio Silva | 157 | 6 | |
| Gastão Elias | 161 | 7 | ||
 Austria | Andreas Haider-Maurer | 163 | 8 |
The following players received wildcards into the singles main draw:
The following players received entry from the qualifying draw:
Markus Eriksson
Uladzimir IgnatikSee main article: 2012 Marburg Open – Singles.
Jan Hájek def. Andreas Haider-Maurer, 6–2, 6–2See main article: 2012 Marburg Open – Doubles.
Mateusz Kowalczyk / David Škoch def. Denis Matsukevich / Mischa Zverev, 6–2, 6–1