The Octonia Stone, also known as Octoney, Octeny, Octona, and Octuna Stone, is a historic boundary marker located near Stanardsville, Greene County, Virginia.

The stone marks the terminus of the westernmost boundary line of the 24,000-acre Octonia Grant.

The stone is engraved with a figure 8, composed of two, nearly perfect circles, with a cross touching the top of the 8.

[3] Correct coordinates are: (38.3337176, -78.4536142) - msw 11Nov2021 It was listed on the National Register of Historic Places in 1970.

[1] This article about a property in Greene County, Virginia on the National Register of Historic Places is a stub.