Two new alkaloids, 6-O-methylhaemanthidine (1) and O,N-dimethylnorbelladine (2), were isolated from Pancratium maritimum L. together with previously reported alkaloids (lycorine, hippeastrine, galanthamine, haemanthamine, haemanthidine, vittatine, 11-hydroxyvittatine, hordenine, 9-O-demethylhomolycorine) and three alkaloids first reported from this plant (habranthine, ungiminorine, ungiminorine N-oxide). The structure of 6-O-methylhaemanthidine (1) was elucidated by spectral analysis (IR, UV, NMR including 2D NMR, MS) and chemical reactions, confirming it is not an artifact, with the β-configuration at C-6 determined via NOE experiments. O,N-dimethylnorbelladine (2), a proposed biosynthetic intermediate of Amaryllidaceae alkaloids, was identified by comparison with a synthetic sample and is first isolated as a natural product, proving its role in the plant's alkaloid biosynthesis. Habranthine, ungiminorine, and ungiminorine N-oxide were also first found in P. maritimum.