Raphitoma arnoldi is a species of sea snail, a marine gastropod mollusk in the family Raphitomidae.
The length of the shell varies between 5 mm and 14 mm.
The shell differs from Raphitoma papillosa <small>(Pallary, 1904)</small> by its taller shape, narrower whorls and by its more compact and regular reticulation.
This species occurs in the Western and Central Mediterranean Sea.