Yes, for most areas beyond the main towns. The wilaya of Djanet and the Tassili n'Ajjer require an accredited local guide, partly for safety and partly because the rock art sites are protected. Your guide also handles the necessary permits with the local tourism office, which saves you a day of paperwork.
Practical answers on visas, desert itineraries, local customs, and how to plan a trip that respects both the landscape and the people you meet along the way.