Ialonus: Celtic. A fertility god (or perhaps two related gods) worshipped in what are now Lancashire and Provence. Associated with fields and gardens.
Ibath: Celtic (Ireland). A Nemed (holy or privileged one); a father or ancestor god.
Ida-ten: Japanese. Buddhist god of law and monasteries; associated with purity, victory, and justice.
Ilamatecuhtli: Aztec. Evil aspect of the mother goddess. During her winter festival, a poor female's heart was cut out, her head chopped off and paraded.
Illapa: Incan. Weather god associated with keeping the Milky Way in a jug and using it to create rain.
Ilma: Finno-Ugrian. God associated with the air.
Ilmarinen: Finno-Ugrian. God of hammerers and blacksmiths; capable of creating practically anything, but is portrayed as being unlucky in love.
Ilmatar: Finno-Ugrian. Sky-goddess; associated with wind and good weather. Name means "female air spirit."
Imana: The Banyarwands, Africa. God associated with goodness, power, planning, and children.
Imhotep: Egyptian. Considered to be the first engineer, architect and physician in history known by name. Later deified and associated with physicians and medicine, knowledge and learning.
Inanna: Sumerian. Goddess of sexual love, fertility, and warfare. Associated with the Underworld.
Inari: Japanese. Androgynous deity associated with rice and food.
Indra: Indian. God of War and Weather, King of the gods. A heroic and almost brash and amorous character.
Inghean Bhuidhe: Celtic (Ireland). Name means "yellow-haired girl"; one of three sisters who comprised a triple goddess. Associated with spring plating, flower festivals, and summer.
Inti: Incan. The sun god. A benevolent deity, married to Pachamama, the Earth goddess.
Ioskeha: North American (Huron). God who duelled with his brother Tawiskara, for control of the world.
Ishikore-dome: Japanese. Transgendered deity associated with creation and creativity.
Ishtar: Assyrian. Goddess of fertility, love, and war. The divine personification of the planet Venus.
Isis: Egyptian. The wife and sister of Osiris and the mother of Horus, she was worshipped as the archetypal wife and mother and represented deified, historical queens.
Ison: West Africa. Tortoise-shelled Goddess associated with the fertility of the Earth.
I-Ti: Chinese. God of wine; associated with wine making.
Itzamna: Mayan. Creator god who lives in the sky. Associated with fertility, medicine, and water.
Itzcoliuhqui: Aztec. An aspect of the god Tezcatlipoca. Associated with chilling cold, darkness, disaster, and volcanic eruptions.
Itzpaplotl: Aztec. Beautiful goddess with death symbols scrawled on her face. A mixture of sensuality and death associated with agriculture, stars, and fate.
Iubdan of the Faylinn: Celtic (Ireland). God-king of the Ulster faeries; associated with wisdom.
Ixchebelyax: Mayan. Goddess who created the visual arts of fabric color designing and painting.
Ixchel: Mayan. Aged jaguar goddess of midwifery and medicine.
Ixchup: Mayan. Young moon goddess; wife of sun god Ah Kinchil.
Ixtab: Mayan. Goddess of suicide, represented with rope around her neck. The Maya believed suicide, especially suicide by hanging, was in certain circumstances an honorable way to die.
Ixtubtun: Mayan. Goddess associated with jade and the protection of jade artisans.
Izanagi: Japanese. Creator-earth god born of the seven divine generations; associated with magic.
Izanaki: Japanese. Personification of the primordial sky.
Izanami: Japanese. Primordial goddess and personification of the Earth and darkness, creation and death.