Thomas Charles MacArthur is an American former insurance executive and politician. He served as the U.S. representative for New Jersey's 3rd congressional district from 2015 to 2019. A Republican, MacArthur served on the city council of Randolph, New Jersey, from 2011 through 2013, and as its mayor in 2013. He was elected to the U.S. House of Representatives in 2014. After leaving Congress MacArthur returned to private business.

Randolph is a township in southwestern Morris County, in the U.S. state of New Jersey. As of the 2020 United States census, the township's population was 26,504, an increase of 770 (+3.0%) from the 2010 census count of 25,734, which in turn reflected an increase of 887 (+3.6%) from the 24,847 counted in the 2000 census.