George Warren Grebenstein (September 19, 1884 – May 21, 1980) was an All-American basketball player at Dartmouth College as a junior in 1905–06.

A forward, he was the first Dartmouth player to be named an All-American while leading the Big Green to a 16–2 record.

[1][2] The Helms Athletic Foundation retroactively named Dartmouth the national champion that season since it occurred prior to the NCAA tournament.

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