Harry Taylor Bagley (December 23, 1874 – January 20, 1919) was an American attorney and politician in the state of Oregon.

A native of Ohio, he was raised in Washington County, Oregon, where he practiced law and was a local official.

He also served as a two-term mayor of Hillsboro, the county seat, and under his administration the city's public works were modernized and roads paved for the first time.

[3] On January 18, 1899, he married Cora M. Rhea, a native of Morrow County in Eastern Oregon, and the daughter of a banker in Heppner.

[4][5] In 1919, he, along with Samuel B. Huston, worked for defendant Rosa Merlo on her appeal to the Oregon Supreme Court of her manslaughter conviction for killing her husband.

[10] Bagley led the official Hillsboro welcome to the arrival of the Portland, Eugene & Eastern electric railroad in January 1914.