Belyov Trinity Church, Eastern Orthodox cathedral in Belyov, Russia.

Belyov Trinity Church is a stone Orthodox cathedral consecrated on 10 May 1785, built in the Baroque style and designated a regional cultural heritage site. Its refectory was enlarged in 1860, when a side chapel dedicated to the Beheading of John the Baptist was added; the walls were painted in 1873 and 1881. Since 27 December 2011 it has served as the cathedral of the Belyov Eparchy.

A wooden Trinity Church was first recorded in 1543, when Prince Vasily Vasilyevich Belyovsky granted it land. During Catherine II's urban reform, which moved cemeteries outside the town, the church was rebuilt in stone on a new site in 1782 and consecrated on 10 May 1785. In 1860 the refectory was enlarged and a side chapel dedicated to the Beheading of John the Baptist was added; the walls were painted in 1873 and 1881. Closed from 1929 to 1947, it became the cathedral of the Belyov Eparchy after the eparchy was established on 27 December 2011.

The cathedral's name comes from the wooden Trinity Church first recorded in 1543, when Prince Vasily Vasilyevich Belyovsky granted it land. On 29 September 2002 the canonization of the Belyov new martyrs — Bishop Ignatius and the nuns Makaria and Anfisa — was held here. Near the church is the grave of Optina monks who moved to Belyov after the Bolsheviks destroyed Optina Pustyn, a spot especially venerated by parishioners.

The cathedral stands in Belyov, in the Tula Oblast, at coordinates 53.81402, 36.12757. The grave of Optina monks who moved to Belyov after the Bolsheviks destroyed Optina Pustyn lies beside the church and is especially venerated by parishioners. Services resumed after the church reopened in 1947.

Near the cathedral is the grave of Optina Pustyn monks who moved to Belyov after the Bolsheviks destroyed their monastery; the site is especially venerated by parishioners. On 29 September 2002 the cathedral hosted the canonisation of the Belyov new martyrs: Bishop Ignatius and the nuns Makaria and Anfisa.