William d'Alton Mann (September 27, 1839 – May 17, 1920) was a Union officer in the American Civil War, a businessman, and a newspaper and magazine publisher.

He ran for U.S. Congress as a Democrat and received a majority of votes, but never took his seat because the "Federal authorities denied him a certificate".

[1] In his later years, he became the publisher of the Mobile Register as well as several popular magazines in the New York City area, including The Smart Set, and Town Topics.

[3] The credibility of the latter was undermined by Mann's tacit admission in civil court to allowing robber barons to purchase immunity from unwanted coverage in the paper.

When finished, Town Topics commented favorably on the portrait of its proprietor in its November 27, 1902 edition, writing: "... Mr. Ury's friends will be pleased to note that his work has broadened a great deal in recent months.