Myosotis chaffeyorum is a species of flowering plant in the family Boraginaceae, endemic to the South Island of New Zealand.

Plants of this species of forget-me-not are perennial with a creeping habit, bracteate inflorescences, and white corollas.

Each rosette has 3–7 sprawling, creeping, ascending or prostrate, unbranched or branched, bracteate inflorescences that are 13–23 cm long.

M. chaffeyorum can be distinguished from M. tenericaulis and M. albiflora by the length : width ratio of the rosette leaf lamina (1.0–1.4 : 1 vs. 1.5–3.6 : 1), partially included anthers with tips only surpassing the faucal scales (vs. fully included anthers wholly below the scales), longer filaments (0.3–0.5 v. 0.0–0.3 mm), and seeds that are often darker in colour (medium to dark brown v. light to medium brown).

[3] The type specimen of M. chaffeyorum is lodged at the Allan Herbarium (CHR) of Manaaki Whenua - Landcare Research, Lincoln.

[3] M. chaffeyorum is found on limestone, marble or ultramafic bluffs and rocks, usually on bare, dry soils, in shady places.