Just Another Diamond Day was the debut album by United Kingdom singer-songwriter Vashti Bunyan.

In the mid to late 1960s, Bunyan was under contract to Andrew Loog Oldham, which saw her release two singles. However, Bunyan found the experience frustrating, and decided to head for the Scottish islands in search of an artistic commune supposedly established by Donovan. She travelled around the countryside with her partner Robert, in a horse-drawn wagon. It was during these travels that she wrote the songs which would later appear on Just Another Diamond Day.

Bunyan returned to London where she was urged by producer Joe Boyd to record her songs while they were still fresh. The recording session took place throughout December 1969 at Sound Techniques in London. Song arrangements were performed by Robert Kirby, who also worked with Nick Drake. Members of Fairport Convention and Incredible String Band contributed to some tracks.

The album was initially released in 1970 but was a commercial failure and Bunyan retired from music for many years as a result of harsh criticism from the music press who described her songs as 'childish' and attacked her voice as 'weak'.

Just Another Diamond Day was re-released by Spinney Records in 2000, its success prompting Bunyan to return to music and eventually record the much delayed follow-up Lookaftering, released in 2005.