The Indonesian giant sailfin dragon (Hydrosaurus microlophus) is a species of agamid native to South Sulawesi Indonesia.

[1] It is the heaviest and longest species of sailfin lizard, making it the largest of all the Agamidae.

[citation needed] It is often mistaken for H. amboinensis[by whom?]

because of the incorrect information of Hydrosaurus amboinensis being the largest of the sailfin dragons.

[2] H. microlophus is oviparous.