Halo: The Essential Visual Guide is a visual guidebook of the Halo universe, published by DK Publishing on July 4, 2011. The book contains images and additional information on the locations, characters, creatures, vehicles, and weapons from the Halo universe, including the introduction of names to previously unnamed characters or objects in the Halo universe, such as the Hierarchs. Each page in the guide is dedicated to one element, focusing on its role and significance in the Halo universe. The book also features over 600 pieces of artwork specially commissioned by Microsoft artists.
- On page 4, in Statistics, the word Air "Assault" is misspelled Air "Assult."
- On page 12, the main illustration used to depict Arcadia is actually the planet Harvest from the first cutscene of Halo Wars.
- On page 16, it is erroneously stated that the MA5C Assault Rifle does not appear in Halo 3: ODST.
- On page 33, the MA37 Assault Rifle is mistakenly referred to as the MA5C Assault Rifle.
- On page 38, the Type-51 Carbine is in one instance mistakenly referred to as "Type-52."
- On page 61, the Sangheili rank of Imperial Admiral is mistakenly listed as "Imperial Commander."
- On page 69, it is erroneously stated that the Flamethrower does not appear in Halo 3: ODST.
- On page 74, UNSC Forward Unto Dawn is mistakenly said to appear in Halo 3: ODST. This is most likely a misinterpretation of the UNSC In Amber Clad's appearance in that game.
- On page 81, the abbreviation of LF.Xx.3273 Flood Super Cell is misspelled "FCS" instead of "FSC."
- On page 119, the MA37 Assault Rifle's shroud and barrel are misaligned, giving the appearance of two under-barrel flashlights.
- On page 126, the M274 Mongoose is mistakenly referred as "M247."
- On page 136, 2401 Penitent Tangent is said to appear after the mission Gravemind, but he is actually only seen at the beginning of the level.
- On page 160, the Rookie should be listed with "UNSC Marine Corps" instead of "UNSC Navy," similar to his squadmates' entries.
- On page 178, the homeworld of the T'vaoan is erroneously stated as Eayn, whilst it is actually T'vao.
- On page 195, Halo 2 is not listed as having taken place on Threshold.
- On page 196, it is erroneously stated that the M831 Troop Transport does not appear in Halo 3: ODST.
- The MAC Gun Spartan operator seems to be Noble Six running in leaked photos from the development of Halo: Reach.