Grand Lake is a lake in the Ottawa River drainage basin in the geographic townships of Barron and Stratton in the Unorganized South Part of Nipissing District in Northeastern Ontario, Canada.

[2] The Achray park campground, formerly a station on the railway, is located on the north shore, and the unincorporated place of Hydro[3] is on the former railway line at the western tip of the lake, near where a Hydro One hydroelectricity transmission line passes.

The lake is notable as the location where Tom Thomson painted The Jack Pine.

[4] There are also some petroglyphs on the granite cliffs on the north side of Carcajou Bay.

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