<jats:title>Abstract</jats:title><jats:p>Three new diterpenoid alkaloids, along with eleven known alkaloids, were isolated from the whole herbs of <jats:italic>Delphinium yunnanense.</jats:italic> The new alkaloids include a rearranged‐type C<jats:sub>19</jats:sub>‐diterpenoid alkaloid, named yunnanenseine A (<jats:bold>1</jats:bold>), and two hetisine‐type C<jats:sub>20</jats:sub>‐diterpenoid alkaloids, named yunnanenseine B and C (<jats:bold>2</jats:bold> and <jats:bold>3</jats:bold>, resp.). Their structures were elucidated by detailed NMR‐spectroscopic studies.