Celtic mythology is a rich and vibrant tapestry that reflects the beliefs, traditions, and cultural heritage of the ancient Celtic peoples across Europe, particularly in regions like Ireland, Scotland, Wales, and Brittany. This mythology comprises a diverse array of stories, gods, goddesses, and supernatural beings that have been passed down through generations, often through oral tradition. Unlike many other mythological systems that feature a singular narrative or pantheon, Celtic mythology is characterized by its regional variations and complexity, encompassing a wide range of tales that explore themes of heroism, love, nature, and the afterlife. The diverse landscapes of the Celtic world, from lush forests and rolling hills to rugged coastlines, are often reflected in these myths, emphasizing the close relationship between the Celts and their environment.

Central to Celtic mythology are its deities, each representing different aspects of life, such as fertility, warfare, wisdom, and the natural elements. Goddesses like Brigid and Danu are celebrated for their nurturing qualities, while heroic figures like Cú Chulainn and Fionn mac Cumhaill embody strength and valor. Additionally, the presence of otherworldly beings, such as the Sidhe (fairy folk), adds to the mystical nature of these narratives, blurring the lines between reality and the supernatural.