John Phillips Jenkins Sensenderfer
- Bats Unknown, Throws Unknown
- Height 5' 9", Weight 170 lb.
- Debut May 20, 1871
- Final Game October 21, 1874
- Born December 28, 1847 in Philadelphia, PA USA
- Died May 3, 1903 in Philadelphia, PA USA
Count Sensenderfer was born in Philly, died in Philly, and played baseball for Philly. He played for the Philadelphia Athletics before professional baseball began, and he played for the Athletics in the National Association. He started decently in 1871, hitting .323, but struggled after that.
He had joined the Athletics in 1867 after having been with the Olympics. After his baseball career, Sensenderfer was involved in politics, serving two terms as Philadelphia County Commissioner and was also an active member of the Democratic Committee of Philadelphia as well as the Pennsylvania Democratic State Committee.
He holds the record for most career at-bats without a walk by a non-pitcher.