There are several... depending on what you mean by fertility. I am assuming you mean crops... So, Proserpina/Persephone (spring and rebirth), Ceres/Demeter (grains), Priapus (gardens), Fauna or Bona Dea, Dionysus/Bacchus (grapes), Anna Perrinna (not sure of the spelling) for the new year,
Eros is the main Greek god of fertility. Liber and Mars were the Roman gods of fertility.
There are several:
Eileithyia or Ilithyia
Artemis
Hera
That would be Hera, the goddess of marriage and women.
Demeter.
Ceres.
rhea is the greek goddess of fertility and motherhood.
Ceres Ops Demeter is the Greek goddess
hera
The month May was named for the Greek goddess Maia, who was identified with the Roman era goddess of fertility, Bona Dea.
Inanna is the goddess of love,fertility,and warfare.Sumerians worships Inanna.
rhea is the greek goddess of fertility and motherhood.
Love, beauty and fertility.
Demeter was the Greek goddess of agriculture.
Ceres Ops Demeter is the Greek goddess
Nature and Fertility. She presided over mountains and fortresses
The harvest, fertility, etc., all she's the goddess of.
hera
If you mean Demeter, she is a Greek goddess of grain, fertility, and harvest and is the mother of Persephone.
Aphrodite is the Greek goddess of love, beauty, and fertility.
The month May was named for the Greek goddess Maia, who was identified with the Roman era goddess of fertility, Bona Dea.
Inanna is the goddess of love,fertility,and warfare.Sumerians worships Inanna.
DianaThe Greek goddess of fertility was Artemis. The Roman equivalent was the goddess Diana.