Several hydroxylated bi- and tri-cyclic terpenoids have been isolated from the aerial parts of Halimium viscosum (Celorico da Beira, Portugal). Together with valparolone, with the same skeleton, two additional compounds have been identified: (4 S)-2 β-acetoxyvalparol-15-en-3-one and (4 S)-2 β-acetoxyvalparol-8(14)-en-3-one. Together with the well-known valpara-3(19),15-dien-2β-ol, valpara-1,13-dien-2α-ol and 2β-acetoxyvalpara-4,15-dien-3α-ol, two new compounds have been isolated, belonging to the valparane class, and identified as valpara-3,15-dien-2β-ol and 3α-hydroxyvalpara-4,15-dien-2-one. There are several bicyclic diterpenoids that should be noted: with labdane skeleton; a diformate and the monoformylderivatives of labd-7-en-3β,15-diol and with halimane skeleton the 15-hydroxy-ent-halim-1(10)-en-18,2β-olide. The total composition of the aerial parts of this plant allows the identification of Celorico da Beira Halimium viscosum as a new chemotype.