(689–773), also known as Ryà Âben, was a Japanese Buddhist monk of the Kegon sect, and clerical founder of the Tà Âdai-ji temple in Nara, Nara Prefecture, Japan. He is popularly known as the . His life spanned the late Asuka period (538–710) to the early Nara period (710–794), a period associated with the establishment of Buddhism in Japan.
According to tradition, Rà Âben was born either in either à Âmi Province in present-day Shiga Prefecture or Sagami Province in present-day Kanagawa Prefecture. Sagami is considered the more likely location. According to legend as a young baby, Rà Âben was snatched by an eagle and dropped off over a pine tree in front of what is now the Nigatsu-dà  Hall. Rà Âben was raised as a monk, and reunited with his mother 30 years later. In one version of the story, Rà Âben wore an amulet of Kannon Bodhisattva since he was a baby, which his mother recognized when she came to Nara as a pilgrim. Records with the Ministry of Justice in Nara at the time, do record Rà Âben as having been raised as a monk since infancy, but do not state anything further as to his origins.
Rà Âben first studied Hossà  Buddhism under the monk (d. 728). Gien and his disciples Rà Âben and Gyà Âki are considered to have created the foundation of Japanese Buddhism at the beginning of the Nara period. In 733, the fifth year of the Tenpyà  era, Rà Âben oversaw expansion and construction of and the massive bronze statue of Vairocana Buddha under the patronage of Emperor Shà Âmu (724–749). Kinshà Â-ji is now the Hokke-dà  hall of Tà Âdai-ji.
In 740, the twelfth year of the Tenpyà  era, an eminent Korean monk of the Silla kingdom (57 BC – 935 AD) named Simsang (, known as Shinjà  in Japan, was invited by Rà Âben to Japan to help establish a new sect based on the Huayan school of thought. This led to the foundation of the Kegon school of Buddhism with permission from Emperor Shà Âmu. Rà Âben subsequently became the second patriarch of the Kegon school.
Rà Âben later presided over the drawing of the eyes ceremony of the Great Buddha statue at Tà Âdai-ji in 751. He was first a bettà  monk at Tà Âdai-ji, but was later promoted to be a high Buddhist priest of the temple.
Rà Âben spent the final years of his life on the establishment of Ishiyama-dera in present-day à Âtsu, Shiga Prefecture. He died on November 16, 773, at the age of 85 at or near Uda in present-day Nara Prefecture.