Microscydmus lynfieldi is a species of minute beetle belonging to the family Scydmaeninae.

The species was described by Austrian entomologist Herbert Franz in 1977, based on holotypes collected from decaying māhoe wood by Guillermo Kuschel from the vicinity of the Wairaki Stream / Tropicana Drive in Lynfield, Auckland, New Zealand in 1975.

[2] In 1990, Microscydmus omahutensis, also found at Lynfield and described by Franz in 1977, was synonymised with M. lynfieldi by Kuschel.

[3] The species has an average length of 0.55 mm (0.022 in), and is a light reddish brown colour.

It is recognisable by its broad head, large eyes and a pronotum of approximate equal length and width.