Two lupane-type triterpenes, lupenone (1) and lupeol (2), a phytosterol, ${eta}-sitosterol$ (3), two ursane-type triterpenes, $3{eta}-acetoxy$ ursolic acid (4) and ursolic acid (5), a lignan, (-)-lyoniresinol $3a-O-{eta}-D-xylopyranoside$ (6), and two flavanol glycosides, $catechin-7-O-{eta}-D-xylopyranoside$ (7) and $catechin-7-O-{eta}-D-apiofuranoside$ (8) were isolated from the stem bark of Sorbus commixta (Rosaceae). Their chemical structures were identified by physicochemical and spectroscopic methods.