I found this on a site.
Sifo-Dyas served as a senior member of the Jedi Council over ten years before the start of the Clone Wars. It was he who apparently ordered the Kaminoans to begin the project which would create the Republic's Clone Army. However, Sifo-Dyas was killed before the events surrounding the Battle of Naboo took place.Whether the Kaminoans had proof of who Sifo-Dyas claimed to be remains to be seen. Neither the senior Masters of the Jedi Council nor the office of the Supreme Chancellor were aware that the Jedi Master had placed the order, and it is still unclear what purpose the army was created for in the first place...
I think it's either Dooku or Palpatine. Because Palpatine was going to create the Empire, and the clones would have been the perfect way to spark it.
Interesting new idea I had-
Sidious/Dooku had nothing to do with ordering the clones, and Syfo-Dias simply ordered them out of a desire to do good for the republic. However, Dooku heard about it and hired Jango to kill him and be the clone model before Syfo-Dias could get back to Coruscant and tell anyone.