Mary Lathrap (née Torrans; April 25, 1838 - January 3, 1895), pen name: Lena; known as "The Daniel Webster of Prohibition", was a 19th-century American author, preacher, suffragist, and temperance reformer.

For 20 years, she was identified with the progressive women of Michigan who had temperance, purity, and prohibition as their watchwords, and the white ribbon as their badge.

[1] A licensed preacher for the Methodist Episcopal Church (1871), she served as president of Michigan's Woman's Christian Temperance Union (1882), co-founded the state's suffrage organization (1870), and worked on the amendment campaign (1874).

She labored in various States and was a strong helper in securing the scientific-instruction law, and in the Michigan, Nebraska and Dakota Territory amendment campaigns.

In 1878, she secured the passage of a bill in the Michigan legislature appropriating US$30,000 for the establishment of the Girls' Industrial Home, a reformatory school, located in Adrian.