Samuel G. Plantz (1859–1924) was a Methodist minister and seventh president of Lawrence University.
He was born in Gloversville, New York on June 13, 1859, second child of James and Elsie Ann (Stoller) Plantz.
He attended Milton College, and received his Bachelor of Arts degree from Lawrence University in 1880.
Plantz became president of Lawrence University in 1894, and served until his death on November 14, 1924, in Sturgeon Bay.
Numerous campus buildings were also erected during his presidency, including the prominent Chapel.