Grinder Rock () is the southernmost of a group of rocks extending from the southeast end of Intercurrence Island, in the Palmer Archipelago. Shown on Argentine and Chilean government charts of 1957. The name, given by the United Kingdom Antarctic Place-Names Committee (UK-APC) in 1960, is descriptive of this toothlike feature.
This article incorporates public domain material from the United States Geological Survey document "Grinder Rock" (content from the Geographic Names Information System).