Choh Hao Li (sometimes Cho Hao Li) (Chinese: 李卓皓; pinyin: Lǐ Zhuōhào; April 21, 1913 – November 28, 1987) was a Chinese-born American biochemist who discovered in 1966 that human pituitary growth hormone (somatotropin) consists of a chain of 256 amino acids.

In 1956, Li and his group showed that ACTH consists of 39 amino acids arranged in a specific order, and that the whole chain of the natural hormone is not necessary for its action.

[4] The whole process included grinding thousands of glands, extracting the hormone, and then identifying its chemistry and biology at the molecular level.

He not only was a widely recognized leader in pituitary-secreted research for his contribution in hormone and growth factors, but also greatly advanced the field of protein chemistry.

In spring 1958, Dr. Li was invited by Dr. Shih Hu to lecture a three-week course regarding the newly developed technology in protein chemistry and his latest pituitary gland research at National Taiwan University with the support from China Foundation for the Promotion of Education and Culture.

At that time, the academic community only knew that protein research was developing rapidly abroad and a scholar had already made extraordinary achievements, and so when Dr. Li introduced the first-hand knowledge, it really attracted and inspired domestic scientists.