Sinnett

Sinnett may refer to:


 * Alfred Percy Sinnett (1840–1921), English author and Theosophist
 * Lawrence C. Sinnett (1888–1962), Seaman in the United States Navy, Medal of Honor recipient
 * Thomas P. Sinnett (1880–1967), member of the Illinois House of Representatives
 * Sinnett Octagon House, historic octagonal house in Muscatine, Iowa built in 1855
 * The Mahatma Letters to A.P. Sinnett, book published in 1923 by A. Trevor Barker