American Slavery as It Is: Testimony of a Thousand Witnesses is a book written by the American abolitionist Theodore Dwight Weld, his wife Angelina Grimké, and her sister Sarah Grimké, which was published in 1839.

The Grimké sisters, Sarah Moore Grimké (1792–1873) and Angelina Emily Grimké (1805–1879), were the first nationally-known white American female advocates of the abolition of slavery and women's rights. They were speakers, writers, and educators.