Is Osama bin Laden a shiite?

No, Osama Bin Laden is a Wahabbi which is a Sunni sect noted for it's insistence on a return to what they consider the original, essentials of Islam. Wahabbism is named after Muhammad ibn Abd-al-Wahhab, who was an Islamic scholar from Saudi Arabia, and who became known for advocating a return to the practices of the first three generations of Islamic history. Wahhabi theology treats the Qur'an and Hadith as fundamental texts, interpreted upon the understanding of the first three generations of Islam and further explained by many various commentaries including that of Ibn-Abd-al-Wahhab. His book Kitab al-Tawhid ("Book of Monotheism"), and the works of the earlier scholar Ibn Taymiyya are fundamental to Wahabism. Like most scholars in Najd at the time, Ibn Abd-al-Wahhab was a follower of Ibn Hanbal's school of jurisprudence but "was opposed to any of the schools (Madh'hab) being taken as an absolute and unquestioned authority," and condemned taqlid. Wahhabism also denounces the practice of blind adherence to the interpretations of scholars and the blind acceptance of practices that were passed on within the family or tribe. Ibn Abd al-Wahhab believed in the responsibility of the individual Muslim to learn and obey the divine commands as they were revealed in the Quran and the Sunnah. Wahhabism is noted not just for urging Muslims to follow the religious duties of Islam, such as salah, but compelling them to do so. In the country of Saudi Arabia for example, the Committee for the Propagation of Virtue and the Prevention of Vice, a state religious police unit, has been set up for this purpose. Wahhabis are sometimes said to follow Hanbali school of fiqh (or Madh'hab) but also said to follow no school of fiqh. In a sense both statements are true. The Wahhabis consider themselves to be `non-imitators` or `not attached to tradition` (ghayr muqallidun), and therefore answerable to no school of law at all, observing instead what they would call the practice of early Islam. However, to do so does correspond to the ideal aimed at by Ibn Hanbal, and thus they can be said to be of his `school`. Above taken from Wikipedia with some minor edits by Kiwimac
No, he was a sunni wahabi