The organisation said this is the first time a tourism attraction in PNG has received such recognition.
The Park received its first TripAdvisor Certificate of Excellence in 2015.
Park General Manager, Michelle McGeorge, said the award has given validation to staff for the many years of hard work into making the park the best recreational attraction in PNG.
Now in its ninth year, the achievement celebrates businesses that are consistently excellent – having earned great traveller reviews on TripAdvisor over the past year.
Certificate of Excellence recipients include restaurants, accommodations and attractions located all over the world that have continually delivered a quality customer experience.
McGeorge said the Nature Park strives to set new benchmarks in tourism, animal welfare and conservation; research and community nature-based education.