Oomsis is a village in Morobe Province of Papua-New Guinea. It is located east of the valley of the Markham River along the Bulolo Highway Road. It is 51.1 km from Lae, and 11.7 km from Gabensis.

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6°41′S 146°48′E / 6.683°S 146.800°E / -6.683; 146.800