Iguania é um clado de répteis da ordem Squamata, geralmente tratada como infraordem.Frost, D.R.; Etheridge, R.; Janies, D. & Titus, T.A. (2001): Total evidence, sequence alignment, evolution of Polychrotid lizards, and a reclassification of the Iguania (Squamata: Iguania). American Museum Novitates 3343: 38 pp.Ted M. Townsend, Daniel G. Mulcahy, Brice P. Noonan, Jack W. Sites Jr., Caitlin A. Kuczynski, John J. Wiens & Tod W. Reeder: Phylogeny of iguanian lizards inferred from 29 nuclear loci, and a comparison of concatenated and species-tree approaches for an ancient, rapid radiation. Molecular Phylogenetics and Evolution, Volume 61, Issue 2, November 2011, doi:10.1016/j.ympev.2011.07.008
Famílias Agamidae Spix, 1825 Chamaeleonidae Rafinesque, 1815 Corytophanidae Fitzinger, 1843 Crotaphytidae Smith & Brodie, 1982 Dactyloidae Fitzinger, 1843 Hoplocercidae Frost & Etheridge, 1989 Iguanidae Oppel, 1811 Leiocephalidae Frost & Etheridge, 1989 Leiosauridae Frost, Etheridge, Janies & Titus, 2001 Liolaemidae Frost & Etheridge, 1989 Opluridae Moody, 1983 Phrynosomatidae Fitzinger, 1843 Polychrotidae Fitzinger, 1843 Tropiduridae Bell, 1843