Alvania coseli is a species of minute sea snail, a marine gastropod mollusk or micromollusk in the family Rissoidae.
Alvania coseli is named after Rudo von Cosel, because of his contributions to malacology in West Africa.
The average length of the shell is , and its shape is minute and conical.
This marine species occurs off the coast of Dakar, Senegal at depths of .