Colin Joseph Egglesfield was born in Farmington Hills, Michigan, United States, on February 9, 1973, under the zodiac sign Aquarius. He is the offspring of Kathleen and William Egglesfield.
He is of American nationality and originates from a multiethnic background about heritage. His mother has Irish ancestry.
Egglesfield was raised in a devout Catholic household alongside his younger brother Sean Egglesfield and older sister Kerry Egglesfield. He was brought to Morris, Illinois, with his family at the age of ten. He continued his education at the University of Iowa following his senior year of high school at Marian Catholic High.