The Louisiade monitor (Varanus louisiadensis) is a species of monitor lizard native to the Louisiade Archipelago of Papua New Guinea.

It was first described in 2023, alongside Varanus tanimbar.

[2] Varanus louisiadensis has a 3% genetic divergence from other species of monitor lizards.

Its body is generally black in coloration, with the presence of yellow patterns that become less distinct with age.

[2] The length of V. louisiadensis heads are about 1.82 times that of their width.