Today Is Yesterday is a 2002 compilation album by English folk/rock singer-songwriter Roy Harper.

Tracks 1–9 date from 1964 to 1965 and were recorded on an old mono Ferrograph quarter-inch Reel-to-reel audio tape deck.

These tracks formed a demo tape that landed Harper his first record contract.

Track 10 is a re-recording of a part of that demo tape and became the B-side of Harper's first single.

Track 17 goes back to 1965–1966 and is the A-side of Harper's first single.