Juan Diego Estrada Constantino (born 1989 in Chilchota, Michoacán) is a Mexican-American long-distance runner. He competed in the 10,000 metres at the 2012 Summer Olympics in London for Mexico. After some confusion about his eligibility after becoming a U.S. citizen, he was excluded from the U.S. Olympic trials even though it was later known that Estrada was misinformed on his eligibility possibilities. Estrada resides in Flagstaff, Arizona.