Chemical investigation into the twigs and leaves of Sapiuminsigne afforded seven new diterpenoids, sapinsignoids A–G (1–7), together with 10 known diterpenoids. The structures of 1–7 were assigned on the basis of detailed spectroscopic analysis and chemical degradation. Compounds 1–4 exhibited significant cytotoxicity against the A-549 tumor cell line (IC50 0.2–1.8 μM), while compounds 1–3 showed