Russian Orthodox Cathedral of the Transfiguration of Our Lord is a historic Russian Orthodox cathedral at 228 N. 12th Street in Williamsburg, Brooklyn. It was built between 1916 and 1921 to the designs by Louis Allmendiger. The plan is based on a Greek cross and is designed in the Russian version of the Byzantine style. The building features characteristic Onion domes atop four octagonal towers and a large central dome each topped by a large, gilded Russian Orthodox cross.

The Cathedral was listed on the National Register of Historic Places in 1980 and is the only example of Byzantine Revival architecture in New York City and possible the United States.

Reverend Konstantín Leshchyov leads a parish of several hundred faithful, many of whom are Russian immigrants and their descendent. Amongst them are several groups including a devout group of believers, those who come mostly to socialize and a group of devout folks covered in tattoos.