Myron richardsonii, also known as Richardson's mangrove snake, is a species of venomous homalopsid snake native to the marine waters of eastern Indonesia and northern Australia.

The specific epithet richardsonii honours Sir John Richardson, collector of the original specimen.

[1] The species is viviparous, with an average litter size of six.

[1] The species’ distribution encompasses the coasts around the Arafura Sea, including the Aru Islands and southern New Guinea as well as northern Australia from the Kimberley eastwards to the Gulf of Carpentaria.

Habitat includes coasts, estuaries and tidal rivers.