A review of the fauna of flat-footed flies (Diptera: Opetiidae and Platypezidae) in the Gemer region (Slovakia) is presented. Based on previously published records and material examined 1 species of Opetiidae and 17 species of Platypezidae are treated, each with comments on its general distribution, biology and faunistics, and/or nature conservation importance. Nine species of Platypezidae are considered particularly significant for the area because of comprising taxa that are endangered, stenotopic or generally rare. Of the five species newly recorded from the Gemer area, one, viz.