The New Zealand Long and Efficient Service Medal was the earliest medal awarded in New Zealand for long and efficient services, being issued between 1 January 1887 to 22 September 1931.

Eligibility for the medal changed over time (see infobox) and, from 1920, could be issued to all members of the New Zealand Military Forces for 16 or 20 years of service (active service between 5 August 1914 and 28 January 1919 counted as double qualifying time).

The obverse of the medal depicts a Royal Crown superimposed over a crossed sword and Taiaha (Maori long club) and surrounded by fern fronds.

The medal's suspension is a 14 mm diameter ring, which passes through a loop fixed to the top of the piece.

The medal is suspended from a ribbon 38 mm wide, crimson in colour with two central white stripes, which were added in 1917.