Eskrima.

I thought I could remember one that uses it primarily, but cannot find reference to it, if it exists. However, there are several forms that DO use it: (these are from Wikipedia) -Western forms:the English Quarterstaff and the French Bâton -The Indian Silambam staff has been used as a weapon since at least the 2nd century, evident from references in ancient Sangam literature at the time. The martial art associated with the Silambam staff is also known as Silambam. The Silambam staff was later incorporated in several Malay martial arts such as Silat. The Chinese staff is called gun (棍 pinyin gùn). Its practise is commonly divided into two main areas: Northern staff techniques (influenced by spear play) and Southern staff techniques. Many styles and techniques exist but the best known outside of China is the Shaolin Temple staff techniques as practised by the monks in Chinese medieval times (Tang dynasty 900s-1000s) and later by their disciples in pre-modern China (1600s-1900s) by anti-Manchu/Ching dynasty revolutionaries (Han Chinese patriots) prior to the wide-spread use of firearms. The techniques made their usual dissemination throughout the rest of Asia to be blended in with other countries' native fighting techniques. It must be pointed out that the Chinese staff techniques as well as other countries' native staff techniques are not wholly original and that there was free trade or espionage amongst the people practising such martial techniques. Japanese short staff techniques (jō) were reportedly invented by Sensei Muso Gonnosuke Katsuyoshi after he was defeated by Miyamoto Musashi in a duel. Stung by his defeat, he invented techniques to fight against a katana using only a stick, and fought Musashi to a draw on their next encounter. Hope this helps.

Although a great many martial arts ALSO use the staff, there are none that I am aware of that MAINLY use the staff ... most martial arts MAINLY use the human body as a living weapon first, then add weapons. Goju Ryu Karate has many different stick weapons, from the classical staff to the small kubotan ... Chow Gar Kung Fu also has many different stick weapons, from the classical staff and spear to the wooden cane. Ninjitsu uses the staff as a foundation weapon for an entire weapons branch of polearms that include spears, halberds, pikes, and even the wooden cane. Hapkido, Hwrangdo, and Tang Soo Do likewise have a great many stick weapons that all start with the staff for the basic foundation, then add spear tips etc. ... and so on ... but they all use the body MAINLY and the staff as an ALSO used weapon.