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Cytisus Desf. (Fabaceae) is a diversified genus enclosing approximately sixty species, which are particularly found around the Mediterranean Sea. Many plants of this genus exhibit bioactive properties such as diuretic, hypnotic, anxiolytic, antiparasitic, antidiabetic and antioxidant [1] and, in particular the latter, has been closely associated to the high content in flavonoids [2]. The present work aims to contribute to the knowledge of Cytisus Desf. chemical composition, through the identification of new flavonoids in that genus. The compounds in focus were detected in ethanolic extracts of Cytisus multiflorus flowers by means of HPLC-DAD, ESI-MS and MSn analyses. These included the two isomers 2′′-O-pentosyl-6-C-hexosyl-luteolin and 2′′-O-pentosyl-8-C-hexosyl-luteolin (MW 580 Da), the two isomers 2′′-O-pentosyl-6-C-hexosyl-apigenin and 2′′-O-pentosyl-8-C-hexosyl-apigenin (MW 564 Da), the 6′′-O-(3-hydroxy-3-methylglutaroyl)-2′′-O-pentosyl-C-hexosyl-luteolin (MW 724 Da) and the 6′′-O-(3-hydroxy-3-methylglutaroyl)-2′′-O-pentosyl-C-hexosyl-apigenin (MW 708 Da). Attending that half of the these compounds were herein described for first time in Fabaceae, overall, the present work is a valuable contribution for the phenolic elucidation of Cytisus genus as well as the Fabaceae family.