Preah Botumthera Som (Khmer: ព្រះបទុមត្ថេរសោម, 1852–1932) was a Cambodian writer. He is also known as Venerable Botumthera Som, Brah Padumatthera in French manuscripts, or often simply as Som (សោម). He is considered one of the best writers in the Khmer language.