The pataria is an eleventh-century religious movement in the Archdiocese of Milan in northern Italy, aimed at reforming the clergy and ecclesiastic government in the province and supportive of Papal sanctions against simony and clerical marriage.

Those involved in the movement are called patarini (also patarines or patarenes, from singular patarino), a word chosen by their opponents, which means "ragpickers", from Milanese patee "rags".

In general the patarini are tradesmen motivated by personal piety.

The conflict between the patarini and their supporters and the partisans of the simoniacal archbishops eventually lead to civil war by the mid-1070s, the Great Saxon revolt.

It receives its most dependable contemporary chronicler in Arnulf of Milan.