See main article: article and 2019 Croatia Open.
Robin Haase and Matwé Middelkoop were the defending champions, but Middelkoop chose to compete in Båstad instead.
Haase played alongside Philipp Oswald and successfully defended the title, defeating Oliver Marach and Jürgen Melzer in the final, 7–5, 6–7(2–7), [14–12].