Oi Dai is Värttinä's 3rd album, and the first after they re-formed in 1990 after losing many members.

It was released in 1991 in Finland by Spirit/Polygram.

It was a great success, and led to Värttinä touring throughout Europe.

In 1994, it was released in the United States by Xenophile Records.

It was later re-released in the US by NorthSide.