| Date: | 5–11 August |
| Edition: | 32nd |
| Location: | Aptos, United States |
| Champs: |  Steve Johnson |
| Champd: | Marcelo Arévalo /  Miguel Ángel Reyes-Varela |
The 2019 Nordic Naturals Challenger was a professional tennis tournament played on hard courts. It was the 32nd edition of the tournament which was part of the 2019 ATP Challenger Tour. It took place in Aptos, United States between 5 and 11 August 2019.
| Country | Player | Rank1 | Seed | |
|---|---|---|---|---|
 Bosnia and Herzegovina | Damir Džumhur | 92 | 1 | |
| Steve Johnson | 94 | 2 | ||
 Japan | Taro Daniel | 118 | 3 | |
| Dominik Köpfer | 123 | 4 | ||
| Bjorn Fratangelo | 124 | 5 | ||
 Belarus | Egor Gerasimov | 130 | 6 | |
| Marcos Giron | 138 | 7 | ||
| Michael Mmoh | 159 | 8 | ||
 France | Enzo Couacaud | 164 | 9 | |
| Japan | Go Soeda | 168 | 10 | |
| Mitchell Krueger | 174 | 11 | ||
 Ecuador | Emilio Gómez | 177 | 12 | |
| Christopher Eubanks | 178 | 13 | ||
 India | Ramkumar Ramanathan | 182 | 14 | |
 Belgium | Ruben Bemelmans | 188 | 16 |
The following players received wildcards into the singles main draw:
The following players received entry into the singles main draw as alternates:
The following players received entry into the singles main draw using their ITF World Tennis Ranking:
The following players received entry from the qualifying draw:
The following player received entry as a lucky loser:
See main article: 2019 Nordic Naturals Challenger – Singles.
Steve Johnson def. Dominik Köpfer 6–4, 7–6(7–4).See main article: 2019 Nordic Naturals Challenger – Doubles.
Miguel Ángel Reyes-Varela def. Nathan Pasha / Max Schnur 5–7, 6–3, [10–8].
