Ola Winslow was an American biographer who wrote about the lives of prominent figures in the 19th century. She was born in 1845 and died in 1921. Her most famous work was a biography of President Abraham Lincoln, which was published in 1866. She also wrote biographies of other notable figures such as Ulysses S. Grant, Robert E. Lee, and William Tecumseh Sherman. Winslow's works were praised for their accuracy and detail.