A new leaf spot disease on bellflower was discovered in Harqin, Chifeng, Inner Mongolia in 2013, and it spread continuously in 2014-2017. Morphological observation and rDNA ITS, gpd and EF-1α sequence analyses proved that the fungus was similar to Stemphylium platycodontis. This is the first report of Stemphylium on bellflower in China.