Egg masses and embryonic development are studied for twenty two species of doridoids from the southern part of the Iberian Peninsula. Egg masses and development are described for the first time for Okenia mediterranea, Trapania hispalensis, Diaphorodoris luteocincta, Diaphorodoris papillata, Jorunna onubensis, Discodoris rosi and Paradoris indecora, whereas development was previously unrecorded for Trapania maculata, Hypselodoris fountandraui, Chromodoris purpurea, Cadlina pellucida and Discodoris maculosa. Of the twenty two species studied, the egg masses of four species: Diaphorodoris luteocincta, Diaphorodoris papillata, Crimora papillata y Aldisa banyulensis can be assigned to Type A of Wilson’s (2002) classification; thirteen other species: Polycera quadrilineata, Hypselodoris tricolor, Hypselodoris picta, Hypselodoris bilineata, Hypselodoris fountandraui, Hypselodoris cantabrica, Chromodoris purpurea, Cadllina pellucida, Jorunna onubensis, Discodoris maculosa, Discodoris rosi, Paradoris indecora and Dendrodoris limbata to Type C; the egg mass of Hypselodoris villafranca to Type A when less than 10 mm long and to Type B otherwise. Egg masses of Doriopsilla areolata were all Type C, except for one produced in aquarium which was of Type B. Egg masses of Okenia mediterranea, Trapania maculata y Trapania hispalensis could not assigned to any of Wilson’s types. Regarding development, eighteen of the twenty two species are Type I or Planktotrophic according to the classification proposed by Thompson (1967) and Bonar (1978); Hypselodoris villafranca is of Type III or with direct metamorphosis; Dendrodoris limbata has a developpment which is intermediate between lecithotrophic and direct metamorphosis, and the type of development could not be determined for Paradoris indecora and Aldisa banyulensis