Phraya Si Sitthisongkhram (Thai: ???????????????????) or birth name Din Tharap (Thai: ???? ??????; 10 May 1891 - 23 October 1933) was a Siamese career army officer.
He became chief of staff of the First Army under the absolute monarchy, and was chief of operations of the army briefly during the post-1932 constitutional monarchy.
He served as deputy commander of the royalist troops during the failed Boworadej Rebellion of 1933.