The Development Bank of Ethiopia is a specialized financial institution established tornpromote the national development agenda through development finance and close technicalrnsupport to viable projects from the priority areas of the government by mobilizing fund fromrndomestic and foreign sources while ensuring its sustainability. While financing developmentrnprojects, however, the bank faces different, in their nature and causes, kinds of problems. Onernof these problems is delay in project implementation resulting cost overrun, repeatedrnadditional loan and loan repayment rescheduling request. The purpose of the study was tornassess the causes for project implementation delay. This study investigates the causes ofrndelay in project implementation for DBE financed projects to determine the mostrnimportant according to the key project participants; internal (bank and project owners) andrnexternal factors. The research identifies and analyses whether the major causes of projectrnimplementation delay are attributed to project owner related factor or the Banks related factorrnor whether delay is attributed to some external factors such as government, supplier andrncontactor related factors like poor customs clearing, infrastructure problems, delays in thernprocurement machineries and materials required for the projects., rework due to design errorsrnetc.rnThe target populations (projects) for the study were selected from DBE Head Office financedrnprojects and 68 projects were selected as sample for the study purpose. For this study 136rnrespondents from DBE and different Projects were selected. The study used both primary andrnsecondary data collection methods. The primary data was collected using questionnaires andrninterviews. Secondary data was derived from the projectâ€™s files, recorded documents by bankrnand different documents such as annual reports, journals, articles, various books, websites,rnother published and unpublished sources and relevant documents. The data from the completedrnquestionnaires was studied, re-coded and entered into the computer using the StatisticalrnPackage for Social Sciences (SPSS) version 24. Descriptive statistics were employed to analyzernquantitative data. The descriptive statistics included standard deviation, means andrnpercentages. The quantitative collected data was analyzed by establishing the regression toolsrnof the various factors identified as causes for project implementation delay.rnThe results of the study showed that project implementation is negatively affected by owners,rnbank and external related causes. As a result if project implementation delay is occurred andrncontinued, the bank will not be able to collect its loan on time which ultimately may lead to lossrnin the operation of the bank