George S. Mills FAIA (1866–1939) was an English-born American architect in practice in Toledo, Ohio from 1892 until 1939.

He then joined the office of leading local architect George I. Barnett before moving to Toledo in 1885.

In 1892 he left to enter private practice, forming a partnership with Harry W. Wachter which lasted until 1897.

[1] After dissolving their partnership Mills worked for fifteen years as an independent practitioner, becoming the leading architect in Toledo.

[3] From their base in Toledo this firm was responsible for buildings as far east as Boston and as far west as San Francisco.