Troglohyphantes similis is a species of spider in the family Linyphiidae that is endemic to Slovenia, living in caves in the Kočevje mountains. It is a relatively small spider, typically 2.5 mm (0.098 in) in length. It has a fawn-reddish cephalothorax, brownish sternum and white abdomen. The species is one of three, alongside Troglohyphantes spinipes and Troglohyphantes gracilis, which are found in contiguous ranges and are sometimes referred to as the Kočevje subterranean spider. It can be distinguished from these relatives by its smaller size and smaller legs.

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