Charles Frederick Chandler (December 6, 1836 - August 25, 1925) was an American chemist, best known for his regulatory work in public health, sanitation, and consumer safety in New York City, as well as his work in chemical education. While Chandler was a very popular instructor, he was not always so popular among his colleagues. He spent much of his time acting as an expert witness in various legal cases and patent disputes, and performed independent consulting work. He remained an integral part chemical education at Columbia University until 1911 when he finally, after 46 years of service at Columbia and 54 years of college teaching, retired from teaching. While chemical instruction made up much of Charles Chandler's career, he was also an energetic public health advocate and sanitation reformer. His work with the New York City Municipal Board of Health led to a number of important sanitary reforms in the city. He implemented major reforms to improve infant nutrition, including stopping the sale of watered-down milk, and instituted a corps of traveling physicians to tend to the residents of tenements. He died in 1925 at the age of 88.