Yi Yi (Chinese: 一一; pinyin: Yī Yī; lit. 'one one'; subtitled A One and a Two) is a 2000 Taiwanese drama film written and directed by Edward Yang. It centers on the struggles of an engineer, NJ (played by Wu Nien-jen), and three generations of his middle-class Taiwanese family in Taipei.

The film's title means "one by one", or "one after another". When written in vertical alignment, the two strokes resemble the character for "two": 二.

Yi Yi premiered on May 14, 2000, at the 53rd Cannes Film Festival, where Yang won the Best Director Award. The film has received universal acclaim since its release and is often regarded as one of the greatest films of the 21st century.