Hydrovatus obtusus, is a species of predaceous diving beetle found in Sri Lanka, Indonesia, Laos, Malaysia, Thailand, Vietnam and possibly in India, Myanmar and China.

[1][2][3] The 4th to 6th antennal segments are enlarged.

In male, stridulatory files consist of many minute discernable ridges.

Male has antenna with unequally broad 4 to 11 segments.

[4] This Dytiscidae-related article is a stub.