Ton Dennenbroek is a Dutch speedcuber and a WCA official of many major European competitions and World championships. He has been a co-host of Speedcubing.com since 2003, where he has a puzzle building website.
Ton began solving Rubik's Cubes in 1981, and discovered a 3-cycle himself that basically allowed him to solve using commutators. In December 1999 he met Ron van Bruchem via the online Rubik’s game. Ron pushed him to use a speedcubing method, bringing his times down from around 45 seconds to sub-20. Beginning with the World Rubik's Games Championship 2003 he worked with Ron in setting up tournaments in Europe and around the world. He is also well-known for having competed in a large number of tournaments (145 as of mid-2017).
In the early 2000s his webpages on speedcubing.com were a useful resource for puzzle building and modding. He also sold cubes for collectors and speedcubers such as Rubik Studio Cubes and vintage 3x3x3, 4x4x4, and 5x5x5 cubes from the 1980s.