St. Anne's Church in Mosar, Neoclassical Catholic church in Mosar, Belarus.

St. Anne's Church in Mosar is a Neoclassical brick church built in 1792, with a rectangular plan under a gabled roof. Its main and side facades end in tall triangular pediments divided into three parts by fluted pilasters, with a rectangular door and an arched window at the centre. A three-tiered bell tower with a hipped roof and cross, built in 1931, stands within a brick arcaded wall.

Robert and Anna Brzostowski, owners of Mosar, funded the church in 1792 and named it after Anna. The Vilnius bishop Wacław Żyliński consecrated it in 1851. A brick bell tower replaced the wooden one in 1926–1931, and the parish counted over 5,700 faithful in 1929. After 1961 it had no resident priest until 1988, yet villagers kept gathering to pray.

The parish keeps a "Book of Sobriety" in the church, where believers promise God for a set period not to drink. In the bell tower, at the initiative of priest Juzef Bulka, Belarus's only anti-alcohol museum displays a moonshine still brought by villagers, a table with a samovar and shawls, and anti-alcohol posters. An Alley of Sobriety was planted by members of Alcoholics Anonymous clubs from Belarus, Latvia and Lithuania.

The church stands in the centre of Mosar, in the Hlybokaye district of the Vitebsk region. A 23-metre cross raised in 2004 on the hill east of the village is visible for 15 km in clear weather. The church is surrounded by a brick arcaded wall with a gate and the three-tier bell tower, which houses the anti-alcohol museum.

In 2004 a 23-metre cross was raised on a hill east of the village for Mosar's 490th anniversary, organised by parish priest Juzef Bulka; on clear days it can be seen 15 km away. The bell tower holds Belarus's only anti-alcohol museum, with a moonshine still and a samovar table.