Tuatha de Danann is a Brazilian Celtic metal band formed in 1995 in Varginha, Minas Gerais; it is known for their merry Celtic dance rhythms, flute melodies, Celtic mythology-inspired lyrics and the original jesting tones such as gnome-choirs, etc. The band is named after the race of supernaturally-gifted people in Irish mythology, the Tuatha Dé Danann, roughly translated to "People of Dana".

Between July and August 2005, Tuatha de Danann did their first tour outside Brazil; they performed in France and Germany. In France, the band played shows in Saint Brieuc, Languidic, Brest, Hennebont, Tours, Grenoble, and Rheims, while in Germany the band played at the Wacken Open Air festival.

Following a hiatus, the band returned in 2013 at the Roça 'n' Roll festival organized by frontman Bruno Maia; during the occasion they performed with Martin Walkyier (ex-Sabbat, ex-Skyclad).

In 2015, they released their first album since 2004's Trova di Danú: Dawn of the New Sun. In the period between both efforts, two groups spun off Tuatha de Danann: Kemunna and Tray of Gift. Maia also released a solo album, Braia.

In 2019, they released In Nomine Élreann, containing 11 songs, nine of which are traditional Irish songs. One of the original songs, "King", was perceived as criticizing Brazil's president Jair Bolsonaro. In 2023 they released The Nameless Cry.

On 13 November 2024, the band announced through their social media that keyboardist Edgard Brito had died at the age of 50.