Three new diterpenoid alkaloids, along with eleven known alkaloids, were isolated from the whole herbs of Delphinium yunnanense. The new alkaloids include a rearranged-type C(19)-diterpenoid alkaloid, named yunnanenseine A (1), and two hetisine-type C(20)-diterpenoid alkaloids, named yunnanenseine B and C (2 and 3, resp.). Their structures were elucidated by detailed NMR-spectroscopic studies.