Algherese (Standard Catalan: Alguerès, IPA: [əɫɣəˈɾɛs]; Algherese: Alguerés, IPA: [alɣaˈɾes]) is the variant of the Catalan language spoken in the city of Alghero (L'Alguer in Catalan), in the northwest of Sardinia. Catalan invaders repopulated the town and expelled the indigenous Sardinian population in 1372, after several revolts.

Catalan was replaced as the official language by Spanish in the early 18th century following the War of the Spanish Succession, then by Italian, but its use remained widespread until at least the 1960's. Today it has semi-official status alongside Italian.

According to recent linguistic research, 22.4% of the population in Alghero are first language speakers and above 90% have some knowledge of the language.

The Algherese variant is classified in the Eastern Catalan block, but it has many differences from Central Catalan. Some of the most obvious:

The Premi Rafael Sari - organised by the Obra Cultural de l'Alguer - is a series of prizes awarded in September each year to the best literary works of poetry and prose written in Alguerese Catalan. Notable poets include Rafael Sari, Pasquale Scanu and Maria Chessa Lai. There is also a long tradition of writing and performing songs in Alguerese Catalan and the Premio Pino Piras is awarded for new songs written in the language. Notable singer-songwriters include Pino Piras and Franca Masu.