John Holroyd Bagley Jr. (November 26, 1832 – October 23, 1902) was an American politician and a United States representative from New York, serving two non-consecutive terms from 1875 to 1877, and from 1883 to 1885.

He settled in Catskill, Greene County and engaged in mercantile pursuits and the manufacture of leather.

Elected as a Democrat to the Forty-fourth Congress, Bagley was a U.S. Representative for the fifteenth district of New York.

Not a candidate for renomination in 1884, he engaged in banking and the insurance business and also served as vice president of the Catskill Mountain Railway Co.

Trustee of the village of Catskill, Bagley was also a member of the New York State Assembly (Greene Co.) in 1888.