Iguanodontidae was named by Bonaparte (1850).

It was reranked as the subfamily Iguanodontidae by Nopcsa (1901); it was synonymized subjectively with Kalodontidae by Huene (1934) and Huene (1934).

It was assigned to Dinosaurii by Bonaparte (1850); to Sauria by Gervais (1853); to Dinosauria by Huxley (1870); to Ornithopoda by Zittel (1890); to Orthopoda by Cope (1869), Cope (1870), Cope (1871), Cope (1875), Cope (1883), Cope (1889), Cope (1891) and Cope (1898); to Ornithopoda by Van Den Broeck (1900); to Kalodontidae by Nopcsa (1901); to Postpubici by Jaekel (1911); to Ornithopodidae by von Zittel (1911); to Praedentata by Tornier (1913); to Phytophagi by Jaekel (1914); to Iguanodontoidae by Hay (1930); to Brachypoda by Thulborn (1974), Thulborn (1975) and Thulborn (1977); to Ornitophoda by Bonaparte (1978); to Ornithischia by Madsen and Miller (1979); to Dryosauroidea by Norman (1984); to Ornithopoda by Dollo (1882) and Bakker (1986); to Ornithopoda by Sauvage (1882), Marsh (1882), Dollo (1884), Marsh (1884), Marsh (1885), Lydekker (1888), Dollo (1889), Sauvage (1895), Marsh (1895), Marsh (1896), Sauvage (1898), Sauvage (1900), Mansel-Pleydell (1902), Arldt (1909), Huene (1909), Huene (1914), Matthew (1915), Lull (1924), Swinton (1936), Roxo (1937), Kuhn (1946), Lapparent (1947), Romer (1956), Huene (1959), Delair (1960), Lapparent (1960), Parsch (1963), Tatarinov (1964), Kuhn (1964), Kuhn (1966), Romer (1966), Charig (1967), Swinton (1970), Thulborn (1970), Haubold (1971), Galton (1974), Galton (1974), Galton (1976), Rozhdestvensky (1977), Galton (1977), Benton (1979), Norman (1980), Bonaparte (1980), Ostrom (1980), McIntosh (1981), Santafé et al. (1982), Weishampel and Weishampel (1983), Dong et al. (1983), Buscalioni and Sanz (1984), Milner and Norman (1984), Buscalioni and Sanz (1987), Carroll (1988) and Weishampel and Bjork (1989); to Styracosterna by Benton (1990); to Ornithopoda by Molnar (1992); to Ankylopollexia by Norman and Weishampel (1990) and Godefroit et al. (1998); to Euornithopoda by Norman (1998); to Hadrosauriformes by Sereno (1997), Sereno (1998) and Sereno (1999); to Iguanodontia by Baur (1891), Osborn (1923), Russell (1984), Norman (1989), Kobayashi and Azuma (2003), You et al. (2003) and Ruiz-Omeñaca et al. (2007); to Iguanodontia by Norman and Sues (2000) and Sánchez-Hernández et al. (2007); to Iguanodontoidea by Hay (1902), Cooper (1985) and Wang et al. (2011); and to Neoiguanodontia by Norman (2014).