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LS I +61 28 is an ON8.5 Vn dwarf with a projected equatorial rotational velocity of $v_{\\textrm e}\\sin{i} \\simeq 298$ km$\\;$s$^{-1}$, while HDE 236672 is an ON9 IVn subgiant with $v_{\\textrm e}\\sin{i} \\simeq 253$ km$\\;$s$^{-1}$ The former is the first rapidly-rotating ON dwarf to be found, and the latter is only the third ON subgiant. 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