I Campionati del mondo di duathlon del 1991 si sono tenuti a Cathedral City, Stati Uniti d'America, in data 30 novembre 1991.
Tra gli uomini ha vinto il neozelandese Matt Brick, mentre la gara femminile è andata alla neozelandese Erin Baker.
Kenny Souza (1990) · Matt Brick (1991, 1992) · Greg Welch (1993) · Normann Stadler (1994) · Oscar Galíndez (1995) · Andrew Noble (1996) · Jonathan Hall (1997) · Yann Millon (1998, 1999) · Benny Vansteelant (2000, 2001) · Tim Don (2002) · Benny Vansteelant (2003, 2004) · Paul Amey (2005) · Leon Griffin (2006) · Paul Amey (2007, 2008) · Jarrod Shoemaker (2009) · Bart Aernouts (2010) · Sergio Silva (2011) · Emilio Martin (2012) · Rob Woestenborghs (2013) · Benoit Nicolas (2014) · Emilio Martin (2015) · Richard Murray (2016) · Benoit Nicolas (2017) · Andreas Schilling (2018) · Benjamin Choquert (2019)
Thea Sybesma (1990) · Erin Baker (1991) · Jenny Alcorn (1992) · Carol Montgomery (1993) · Irma Heeren (1994) · Natascha Badmann (1995) · Jackie Gallagher (1996) · Irma Heeren (1997, 1998) · Jackie Gallagher (1999) · Stephanie Forrester (2000) · Erika Csomor (2001) · Corine Raux (2002) · Edwige Pitel (2003) · Erika Csomor (2004) · Michelle Dillon (2005) · Catriona Morrison (2006) · Vanessa Fernandes (2007, 2008) · Vendula Frintová (2009) · Catriona Morrison (2010) · Katie Hewison (2011) · Felicity Sheedy-Ryan (2012) · Ai Ueda (2013) · Sandra Levenez (2014) · Emma Pallant (2015, 2016) · Felicity Sheedy-Ryan (2017) · Sandrina Illes (2018) · Sandra Levenez (2019)