Police in Llandeilo and Llandovery say they are investigating a spate of quad bike thefts from farms in the areas.
There have been thefts in Llangadog, Myddfai and Ffarmers, as well as many other rural locations.
Police are advising farmers to take steps to help minimise the opportunities for thefts.
This includes removing keys from ignitions after use, locking barns or outbuildings wherever the quads may be kept.
Police are asking anyone who has information about these crimes to call 101.