The World of Greyhawk
For those seeking to follow a patron deity, here is a list of the gods and goddesses of Oerth.
Greater Gods
Beory - Goddess of Nature and Rain. The Earth Mother. (True Neutral)
Boccob - God of Magic and Knowledge (True Neutral)
Cyndor - God of Time, Continuity, and Infinity (Lawful Neutral)
Incabulos - God of Evil, Plagues, and Nightmares (Neutral Evil)
Istus - Goddess of Fate and Destiny (True Neutral)
Kord - God of Athletics, Sports, and Brawling (Chaotic Good)
Lendor - God of Time (True Neutral)
Nerull - God of Death, Darkness, and the Underworld (Neutral Evil)
Pelor - God of the Sun, Strength, Light, and Healing (Neutral Good)
Procan - God of the Oceans, Seas, and Salt (True Neutral/Chaotic Neutral)
Rao - God of Peace, Reason, and Serenity (Lawful Good)
Tharizdun - God of Eternal Darkness and Decay (Evil)
Ulaa - Goddess of Hills, Mountains, and Gemstones (Lawful Good)
Wee Jas - Goddess of Magic and Death (Lawful Neutral)
Zilchus - God of Money, Prestige, Power and Influence (Lawful Neutral)
Lesser Gods
Allitur - God of Ethics and Propriety (Lawful Good/Lawful Neutral)
Atroa - Goddess of Spring, the East, and the Wind (Neutral Good)
Beltar - Goddess of Malice, Pits, and Deep Caves (Chaotic Evil)
Berei - Goddess of Home, Family, and Agriculture (Neutral Good)
Bleredd - God of Metal, Mines, and Smiths (True Neutral)
Bralm - Goddess of Insects and Industriousness (True Neutral/Lawful Neutral)
Celestian - God of Stars, Space, and Wanderers (True Neutral/Neutral Good)
Delleb - God of Reason and Intellect (Lawful Good)
Ehlonna - Goddess of Forests, Flowers, and Meadows (Neutral Good)
Erythnul - God of Hate, Envy, Malice, and Panic (Chaotic Evil)
Fharlanghn - God of Horizons, Distance, and Travel (True Neutral/Neutral Good)
Fortubo - God of Stone, Metals, and Mountains (Lawful Good/Lawful Neutral)
Geshtai - Goddess of Lakes, Rivers, and Wells (True Neutral)
Heironeous - God of Chivalry, Honor, Justice, and Valor (Lawful Good)
Hextor - God of War, Discord, and Massacres (Lawful Evil)
Joramy - Goddess of Fire, Volcanoes, Anger, and Quarrels (True Neutral/Neutral Good)
Kurell - God of Jealousy, Revenge, and Thievery (Chaotic Neutral)
Lirr - Goddess of Prose, Poetry, and Art (Chaotic Good)
Llerg - God of Beasts and Strength (Chaotic Neutral)
Lydia - Goddess of Music, Knowledge, and Daylight (Neutral Good)
Myhriss - Goddess of Love and Beauty (Neutral Good)
Norebo - God of Luck, Gambling, and Risk (Chaotic Neutral)
Obad-hai - God of Nature, Wildlands, Freedom, and Hunting (True Neutral)
Olidammara - God of Music, Revelry, Roguery, and Wine (True Neutral/Chaotic Neutral)
Phaulkon - God of Air, Winds, and Clouds (True Neutral/Chaotic Neutral)
Pholtus - God of Light, Resolution, and Law (Lawful Good/Lawful Neutral)
Phyton - God of Beauty and Nature (Chaotic Good)
Pyremius - God of Fire, Poison, and Murder (Neutral Evil)
Ralishaz - God of Chance, Ill-Luck, and Misfortune (Chaotic Neutral/Chaotic Evil)
Raxivort - God of Rats (Chaotic Evil)
St. Cuthbert - God of Wisdom, Dedication, and Zeal (Lawful Good/Lawful Neutral)
Sotillion - Goddess of Summer, the South Wind, Ease, and Comfort (Chaotic Good/Chaotic Neutral)
Syrul - Goddess of Deceit, False Promises, and Lies (Neutral Evil)
Telchur - God of Winter, the North Wind, and Cold (Chaotic Neutral)
Trithereon - God of Individuality, Liberty, and Retribution (Chaotic Good)
Velnius - God of the Sky and Weather (True Neutral/Neutral Good)
Wenta - Goddess of Autumn, the West Wind, and Harvest (Chaotic Good)
Xan Yae - Goddess of Twilight, Shadows, and Stealth (True Neutral)
Xerbo - God of Sea, Water Travel, Money and Business (True Neutral)
Zodal - God of Mercy, Hope, and Benevolence (Neutral Good)
Demigods
Iuz - Demigod of Oppression, Deceit, and Pain (Chaotic Evil)
Rudd - Demigoddess of Chance, Good Luck, and Skill (Chaotic Neutral/Chaotic Good)
Wastri - Demigod of Amphibians (Lawful Neutral/Lawful Evil)
Zagyg - Demigod of Humor, Occult Studies, and Eccentricity (Chaotic Neutral/Chaotic Good)
Zuoken - Demigod of Physical and Mental Mastery (True Neutral)