Saïdia (Arabic: السعيدية, romanized: Al-sa'idiyya; Berber languages: ⴰⵊⵔⵓⴷ, Ajrud), known as the "Blue Pearl", is a coastal town in northeastern Morocco.

Its 14 km (9 mile) coastline is one of the longest beaches of Morocco and is characterized by its golden sand and Mediterranean climate, making it a popular international tourist destination.

It is surrounded by a natural bird preserve of marsh and woodland called Moulouya National Parc.

The nucleus of Saïdia dates from 1883 and was the work of Sultan Hassan I, who built a 15,600-square-meter (3¾ acre) casbah (fortress) on the left bank of the mouth of the river Kiss.

Its purpose was to monitor and regulate the movement of people to and from Algeria, which was then under French sovereignty.