Bei Shizhang (simplified Chinese: 贝时璋; traditional Chinese: 貝時璋; pinyin: Bèi Shízhāng; Wade–Giles: Pei Shih-chang; October 10, 1903 – October 29, 2009), or Shi-Zhang Bei, was a Chinese biophysicist, embryologist, politician, and writer.

He found the department of biology, Zhejiang University in 1929, and work there for 20 years.

He was the oldest member of both the Academia Sinica and the Chinese Academy of Sciences at the time of his death.

The asteroid 31065 Beishizhang was named in his honour on the occasion of his 100th birthday.

[1] Bei Shizhang died in his home in Beijing on October 29, 2009, aged 106.