Lughnasadh is the first harvest festival celebrated by Neopagans. Lughnasadh is celebrated between Litha and Mabon around August 1 in the northern hemisphere.

The holidays mark the beginning of the harvest season and were celebrated in abundance in Ireland, Scotland, and the Isle of Man in the early 20th century. However, the celebration is slowly fading away with just a handful of communities continuing the tradition.

Historically, Lughnasadh was celebrated to honor the death of God Lugh's mother Tailtiu who is believed to have passed away from exhaustion after clearing the vast plains of Ireland for agriculture. The earlier celebration included a funeral feast followed by athletic competitions called Áenach Tailten.

In later times, the festival was attended by kings who made laws and solved disputes. In addition to the athletic part of the celebrations, storytelling, proclamation of law, setting legal disputes, matchmaking, and trial marriages also became an integral part of the Lughnasadh celebration.

In modern times, neopaganism holds ancient traditions while celebrating Lughnasadh. It is also called one of the two auspicious occasions to get married. The modern celebration includes observation of fairs and festivals like the Puck Fair.

Most commonly the festival is celebrated on August 1 in the northern hemisphere and February 1 in the southern hemisphere. However, some neopagans observe the holiday on the astronomical midpoint between the summer solstice and the autumn equinox.