Blackpatch is a townland in County Mayo, and somewhere within it lies a graveyard that has been recorded as an archaeological monument, yet remains largely undocumented in any publicly accessible form. It occupies that curious category of Irish heritage site that is known to exist, has been marked and logged, but has not yet had its story told in any formal, retrievable way.

County Mayo contains hundreds of burial grounds ranging from early medieval enclosures associated with forgotten local saints to post-Famine graveyards that reflect the devastation of the 1840s. Many townland graveyards in the west of Ireland were established beside the ruins of early churches, or simply grew up around a spot that local tradition held to be sanctified ground, sometimes without any surviving structure to explain the original impulse. The prefix "Black" in Irish placenames often derives from the Irish word "dubh", meaning dark, and can refer to dark soil, a shaded hollow, or occasionally a more sombre association with plague or mortality. Whether any such etymology connects meaningfully to this particular site is not currently documented.