Chironius is a genus of New World colubrid snakes, commonly called sipos (from the Portuguese word cipó for liana), savanes, or sometimes vine snakes. There are 23 described species in this genus.

Species: The following 23 species are recognized as being valid.

• Chironius bicarinatus (Wied, 1820) – two-headed sipo
• Chironius brazili
• Chironius carinatus (Linnaeus, 1758) – Amazon coachwhip
• Chironius challenger Kok, 2010
• Chironius diamantina
• Chironius exoletus (Linnaeus, 1758) – Linnaeus´s sipo
• Chironius flavolineatus (Boettger, 1885) – Boettger´s sipo
• Chironius flavopictus
• Chironius foveatus Bailey, 1955 – South American sipo
• Chironius fuscus (Linnaeus, 1758) – brown sipo
• Chironius gouveai Entiauspe-Neto, Lúcio-Lyra, Koch, Marques-Quintela, Diesel-Abegg & Loebmann, 2020 – Gouvea´s sipo
• Chironius grandisquamis (W. Peters, 1869) – Ecuador sipo
• Chironius laevicollis (Wied, 1824) – Brazilian sipo
• Chironius laurenti Dixon, Wiest & Cei, 1993
• Chironius leucometapus – yellow-headed sipo
• Chironius maculoventris – central sipo
• Chironius monticola Roze, 1952 – mountain sipo
• Chironius multiventris Schmidt & Walker, 1943 – long-tailed machete savane
• Chironius quadricarinatus (F. Boie, 1827) – central sipo
• Chironius scurrulus (Wagler, 1824) – Wagler´s sipo, smooth machete savane
• Chironius septentrionalis Dixon, Wiest & Cei, 1993 – South American sipo
• Chironius spixii
• Chironius vincenti (Boulenger, 1891) – St. Vincent blacksnake

Nota bene: A binomial authority in parentheses indicates that the species was originally described in a genus other than Chironius.

Conservation status: The St. Vincent Blacksnake, Chironius vincenti, is listed as critically endangered by the IUCN Red List due to its extremely limited range on the Island of St. Vincent.