<jats:title>Abstract</jats:title><jats:p>From the aerial parts of <jats:italic>Delphinium buschianum</jats:italic> <jats:sc>Grossh</jats:sc>., collected in Turkey, a new diterpenoid alkaloid <jats:bold>1</jats:bold>, named budelphine, was isolated along with the known diterpenoid alkaloids karakoline (<jats:bold>2</jats:bold>), 18‐hydroxy‐14‐<jats:italic>O</jats:italic>‐methylgadesine (<jats:bold>3</jats:bold>), delsoline (<jats:bold>4</jats:bold>), lapaconidine (<jats:bold>5</jats:bold>), columbianine (<jats:bold>6</jats:bold>), 14‐benzoylneoline (<jats:bold>7</jats:bold>), and hetisine (<jats:bold>9</jats:bold>). The structure of <jats:bold>1</jats:bold> was established on the basis of <jats:sup>1</jats:sup>H‐, <jats:sup>13</jats:sup>C‐, DEPT, <jats:sup>1</jats:sup>H,<jats:sup>1</jats:sup>H‐COSY, NOESY, HSQC, and HMBC NMR studies.