A fiber optic splitter module includes a body including a front wall, a rear wall, and first and second side walls together at least partially defining an interior space. The first side wall includes a tongue extending longitudinally along the first side wall, and the second side wall includes a first groove that is complementary to the tongue. The fiber optic splitter module also includes an optical splitter positioned in the interior space, an input fiber extending through the front wall or the rear wall into the interior space and optically coupled to the optical splitter, and a plurality of output fibers extending through the front wall or the rear wall into the interior space and optically coupled to the optical splitter.