Ralph Hartley Wetmore (April 27, 1892 – April 28, 1989) was a professor of botany at Harvard University from 1926 until 1962, known for his studies of plant growth and development.

[1][2][3] Wetmore was born in Yarmouth, Nova Scotia, and attended Acadia University, earning a bachelor's degree in 1921.

He was married to Marion G. Silver from 1923 until her death in 1935, and in 1940 married Olive (Hawkins) Smith, who later became acting dean of Radcliffe College.

He died in Boxford, Massachusetts, at the age of 97.

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