Y Dydd Olaf (meaning "the last day") is the first solo album by Welsh singer-songwriter Gwenno.

The album was initially released on a small scale by the independent Peski Records label in October 2014 and sold out completely.

Since the album was released, permission for an English translation of Owain's book was granted, 40 years after it was first published in Welsh.

The album is sung predominantly in Welsh with the final track, Amser, being a musical rendition of a Cornish poem by her father, Tim Saunders.

It was also chosen by readers of Y Selar, a Welsh music magazine, as the 4th best album of 2014,[16] and by Allmusic as one of the best Indie Records of 2015.