St. John's Episcopal Church is located in Ellicott City in Howard County, Maryland, United States.

The church stands on a land grant originally patented as "Three Brothers".

A section of the land owned by Caleb Dorsey was donated for the church.

The church was designed by architect Norris G. Starkweather, who also designed White Hall, Temora, and First Presbyterian Church and Manse.

[1] Dr. Charles Worthington Dorsey and George Howard oversaw the construction.