The IUPAC Recommendations 2005, Nomenclature of Inorganic Chemistry replaces their previous recommendations "Nomenclature of Inorganic Chemistry, IUPAC Recommendations 1990 (Red Book I)", and "where appropriate" (sic) "Nomenclature of Inorganic Chemistry II, IUPAC Recommendations 2000 (Red Book II)". The recommendations take up over 300 pages and the full text can be downloaded from IUPAC. Corrections have been issued.

Apart from a reorganisation of the content, there is a new section on organometallics and a formal element list to be used in place of electronegativity lists in sequencing elements in formulae and names. The concept of a preferred IUPAC name (PIN), a part of the revised blue book for organic compound naming, has not yet been adopted for inorganic compounds. There are however guidelines as to which naming method should be adopted.

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