Susan Bogert Warner (July 11, 1819 – March 17, 1885) was a popular 19th-century American writer. She wrote 30 books under the name, "Elizabeth Wetherell".
She was born in New York City to upscale parents. She was privately educated. Her first book was the sentimental and moralistic The Wide, Wide World (1851). It is believed to be the first book by an American writer to sell one million copies.
Her novel The Hills of the Shatemuc (1856) sold 10,000 copies on the day of its publication. She wrote some children's books and Bible-themed books. She sometimes co-wrote with her sister, Anna. Anna wrote the popular children's hymn, "Jesus Loves Me This I Know".
Susan Warner died in Highland Falls, New York. She is buried in the West Point Cemetery.