| 2018 Heilbronner Neckarcup | |
|---|---|
| Date | 14–20 May |
| Edition | 5th |
| Draw | 32S / 16D |
| Surface | Clay |
| Location | Heilbronn, Germany |
| Champions | |
| Singles | |
 Rudolf Molleker | |
| Doubles | |
 Rameez Junaid /  David Pel | |
The 2018 Heilbronner Neckarcup was a professional tennis tournament played on clay courts. It was the fifth edition of the tournament which was part of the 2018 ATP Challenger Tour. It took place in Heilbronn, Germany between 14 and 20 May 2018.
| Country | Player | Rank1 | Seed |
|---|---|---|---|
| AUS | John Millman | 58 | 1 |
 CZE | Jiří Veselý | 80 | 2 |
| GER | Yannick Maden | 118 | 3 |
| GER | Yannick Hanfmann | 132 | 4 |
 EST | Jürgen Zopp | 135 | 5 |
 SUI | Henri Laaksonen | 145 | 6 |
 RUS | Alexey Vatutin | 146 | 7 |
 SVK | Norbert Gombos | 150 | 8 |
The following players received wildcards into the singles main draw:
The following players received entry from the qualifying draw:
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