Question: Who made the decision to bomb pearl harbor?
Disambiguated questions and answers: question: Who made the decision to plan to bomb pearl harbor?
Who made the decision to approve the plan to bomb pearl harbor?
answer: Admiral Isoroku Yamamoto,  Rear Admiral Ryūnosuke Kusaka, with assistance from Captain Minoru Genda and Yamamoto's Deputy Chief of Staff, Captain Kameto Kuroshima
Japanese military leadership
Hirohito
Emperor Hirohito
Natural Questions answer: Emperor Hirohito (from the Wikipedia article "Events leading to the attack on Pearl Harbor")