An LC optical fiber cable adapter includes a main body and a connecting mechanism. The main body includes a base wall, and first and second connecting walls extending respectively from opposite lateral edges of the base wall. The first connecting wall has a first front wall segment and a first rear wall segment. The second connecting wall has a second front wall segment and a second rear wall segment. The connecting mechanism includes a first connecting unit provided on the first front wall segment, and two second connecting units. Each of the second connecting units is provided on a respective one of the second front and rear wall segments of the second connecting wall, and has a contour matching that of the first connecting unit.