Oaks Pioneer Church, formerly known as St. John's Episcopal Church, in southeast Portland in the U.S. state of Oregon is a non-denominational one-story chapel listed on the National Register of Historic Places.

[3] Located in Oaks Pioneer Park in the Sellwood neighborhood, the rectangular post-and-beam structure has a footprint of 18 by 42 feet (5.5 by 12.8 m).

Fashioned from a partly completed house owned by pioneer Lot Whitcomb, it was the first Episcopal church in Oregon.

The church, originally sited on the outskirts of Milwaukie, was moved nearer the town's center in 1862.

Modifications over the years included revisions to the chancel in 1869 and the windows, siding, and belfry in 1888.