Two triterpenoids, 24-methylene-3,4-seco-cycloart-4(28)-en-3-oic acid (1) and 3-oxo-$9{eta}$-lanosta-7,22Z,24-trien-26,23-olive (6) were isolated from Abies koreana, together with $eta$-sitosterol (2), maltol (3), ${eta}-sitosterol-O-{$eta}-D-glucoside$ (4), and hexacosylferulate (5). The structures of the compounds were established based on the spectroscopic data. The cytotoxic activities of triterpenoids have been evaluated using the sulforhodamine B (SRB) method. Compound 1 showed moderate cytotoxicities against human lung carcinoma (A549), ovarian carcinoma (SK-OV-3), malignant melanoma (SK-MEL-2), and colon carcinoma (HCT-15) cell lines.