The National Livestock Identification System (NLIS) Sheep & Goats is Australia's system for identifying and tracing sheep, lambs and farmed goats. It is a mob-based system that links animals with the properties on which they have run.

This national livestock identification system enhances Australia's ability to maintain access to key export markets and helps to quickly contain a major food safety or disease incident. It is being implemented by industry in partnership with governments across Australia.

NLIS Sheep & Goats was introduced on 1 January 2006. It uses visually readable ear tags printed with a Property Identification Code (PIC) to identify mobs of sheep and goats. Traceability is provided by the combination of tags, movement documents and records.

All sheep must be ear tagged before they are moved from any property to a saleyard, abattoir or another property. The tag must be printed with the property identification code (PIC) of the property the sheep are moving from unless the sheep are bought in sheep and have already been tagged. A movement document ('national vendor declaration' or 'transported stock statement') must be fully completed and accompany the sheep. If the mob is non-vendor bred or mixed and contains tags with different PICs, all PICs must be written on the movement document or a pink post breeder tag must be used with the current property's PIC printed on it for those sheep which have been bought in.

From 1 July 2010 all mob-based movements of sheep and goats between properties need to be recorded on the NLIS database.