土曲霉（学名：Aspergillus terreus）为发菌科曲菌属下的一个种。

Aspergillus terreus, also known as Aspergillus terrestrius, is a fungus (mold) found worldwide in soil. Although thought to be strictly ****ual until recently, A. terreus is now known to be capable of sexual reproduction. This saprotrophic fungus is prevalent in warmer climates such as tropical and subtropical regions. Aside from being located in soil, A. terreus has also been found in habitats such as decomposing vegetation and dust. A. terreus is commonly used in industry to produce important organic acids, such as itaconic acid and cis-aconitic acid, as well as enzymes, like xylanase. It was also the initial source for the drug mevinolin (lovastatin), a drug for lowering serum cholesterol.