- Olof Essvik
- 5.35 metre metre(s)
- Sweden (Skövde)
The thickest book unpublished is 5.35 m (17 ft 6.6 in.), and was achieved Olof Essvik (Sweden), in Skövde, Sweden, on 19 November 2021.
The book itself has over 90,000 pages and the attempt was part of an event at a museum of art.