George H. McLain (June 24, 1901 – July 12, 1965) was a United States Democratic politician from California and an influential pension promoter from the 1930s through the early 1950s.
McLain began his political career campaigning on behalf of 1934 California gubernatorial candidate Upton Sinclair, before turning to social organizing.
In 1949, he was accused of bribing state lawmakers, but the case was dismissed the following year by California's Third District Court of Appeal.
He was the only opponent of the heavily favored favorite son candidate, Governor Pat Brown.
He also ran twice for the United States Senate: as a Democratic write-in in a 1946 special election and for his party's nomination in 1964, losing both times.