Mark Tewksbury, (born February 7, 1968) is a Canadian former competition swimmer.
He is best known for winning the gold medal in the 100-metre backstroke at the 1992 Summer Olympics.
He also hosted the first season of How It's Made, a Canadian documentary series, in 2001.
Tewksbury was awarded the Meritorious Service Medal (Civil Division) in 1993 for being a "motivational speaker and a gifted athlete."