Yei Theodora Ozaki (December 1870 – December 28, 1932) was an early 20th-century translator of Japanese short stories and fairy tales. Her translations were fairly liberal but have been popular, and were reprinted several times after her death.

According to "A Biographical Sketch" by Mrs. Hugh Fraser, included in the introductory material to Warriors of old Japan, and other stories, Ozaki came from an unusual background. She was the daughter of Baron Ozaki, one of the first Japanese men to study in the West, and Bathia Catherine Morrison, daughter of William Morrison, one of their teachers. Her parents separated after five years of marriage, and her mother retained custody of their three daughters until they became teenagers. At that time, Yei was sent to live in Japan with her father, which she enjoyed. Later she refused an arranged marriage, left her father's house, and became a teacher and secretary to earn money. Over the years, she traveled back and forth between Japan and Europe, as her employment and family duties took her, and lived in places as diverse as Italy and the drafty upper floor of a Buddhist temple.

All this time, her letters were frequently misdelivered to the unrelated Japanese politician Yukio Ozaki, and his to her. In 1904, they finally met, and soon married.