Ludza is a town in the Latgale region of eastern Latvia. Ludza is the oldest town in Latvia and this is commemorated by a key in its coat of arms. Ludza is the administrative centre of Ludza Municipality that is located nearby the Russian border. The population as of 2020 was 7,667.

Latgale, also known as Latgalia is one of the Historical Latvian Lands. It is the easternmost region of the country and lies north of the Daugava River. While most of Latvia is historically Lutheran, Latgale is predominantly Roman Catholic: 65.3% according to a 2011 survey. After the Counter-Reformation it was the northernmost predominantly Catholic province or region in Europe. There is a considerable Eastern Orthodox minority (23.8%), of which 13.8% are Russian Orthodox Christians and 10.0% are Old Believers. As of 2020, the region's population was 255,968.