The Pennsylvania General Assembly, consisting of the House of Representatives and the Senate, convened on January 20, 1891, to elect a Senator to fill the term beginning on March 4, 1891. Incumbent RepublicanJ. Donald Cameron, who was elected in an 1877 special election and re-elected in 1879 and 1885, was a successful candidate for re-election to another term. The results of the vote of both houses combined are as follows: