The common goal of the Water Framework Directive (WFD) published by The European Parliament and EuropeanCouncil and the Regulation on the Management of Surface Water Quality Directive (RMSWQ) published by the Republic ofTurkey, Ministry of Forestry and Water Affairs, is to provide all water bodies to achieve a fine ecological status. Thesedirectives require the use of relevant biological quality elements and diatoms constitute an important group within theseelements. The use of diatom based indices for assessing ecological conditions in inland water systems is increasing day by day.The current study was performed with the aim of determination of the ecological status of the Taşmanlı Pond based on epilithicdiatoms, physico-chemical parameters and to estimate pond water quality using diatom indices. For this purpose, epilithicdiatom and water samples were collected from 3 stations in the pond in monthly intervals from March 2008 to March 2009.The identifications of the sampled revealed presence of a total of 46 taxa in the sampled stations. Achnanthidium minutissimum(Kützing) Czarnecki, Nitzschia acicularis (Kützing) W. Smith, Navicula cincta (Ehrenberg) Ralfs in Pritchard and Naviculacryptocephala Kützing were the dominant taxa in all stations. According to Regulation on the Management of Surface WaterQuality directive, the pond water was classified as III-IV quality class and trophic status changed from mesotrophic toeutrophic. Significant correlation was determined between LTDI (Lake Trophic Diatom Index) and EQR (Ecological QualityRatio). The values of LTDI and EQR indicate that, pond water has class III (poor, moderately polluted site) water quality.