Guinea fowl coronavirus (GfCoV), a recently characterized avian coronavirus, was identified from outbreaks of fulminating disease (peracute enteritis) in guinea fowl in France. The full-length genomic sequence was determined to better understand its genetic relationship with avian coronaviruses. The full-length coding genome sequence was 26,985 nucleotides long with 11 open reading frames and no hemagglutinin-esterase gene: a genome organization identical to that of turkey coronavirus [5' untranslated region (UTR)-replicase (ORFs 1a, 1ab)-spike (S) protein-ORF3 (ORFs 3a, 3b)-small envelop (E or 3c) protein-membrane (M) protein-ORF5 (ORFs 4b, 4c, 5a, 5b)-nucleocapsid (N) protein (ORFs N and 6b)-3' UTR]. This is the first complete genome sequence of a GfCoV and confirms that the new virus belongs to group gammacoronaviruses.