Pycnarmon mioswari is a moth in the family Crambidae.

It is found in Papua New Guinea, where it has been recorded from Mioswar Island.

The forewings are white, with a small sooty black spot near the base of the cell and a larger round one at the end.

There is a costal black spot before the apex, from which springs a pale transverse ochreous line reaching the inner margin.

The hindwings are white, with a small dark spot near the base and a thin median line with a darker hind margin.