The actor took to Twitter to share the picture of his injured finger.
Jackman, who stars as a recluse and fisherman in the stage drama, accidentally cut himself with a knife while chopping a lemon around half an hour into the performance.
The actor, however, did not let the injury affect his performance as he grabbed a towel and carried on doing his part, reported People magazine.
The star, 46, was examined by doctors but didn't need stitches.
The Jez Butterworth play opens on November 16.