Philbrook (November 30, 1857 – May 31, 1933) was a Maine politician, lawyer and judge.
A Republican, Philbrook was represented Waterville in the Maine House of Representatives from 1897–1899 and the Mayor of Waterville from 1899–1900.
He was the Maine Attorney General from 1909–10 under Governor Bert M.
Fernald and Maine Supreme Court Justice from April 1913 to November 1928.