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This paper presents the research finding of efficiency benchmarking for national contractors using Data Envelopment Analysis (DEA). It aims to compare the efficiency of contractors and to obtain the best performing contractor against which peer firms may benchmark their performance. Input measures were number of staff, staff cost, number of completed projects in one year, total value of completed projects in one year) while output measures were revenue and net profit. This research sampled twenty four large construction firms operating in the Indonesian construction market, with a wide variety of organization ownership types. Based on the average DEA scores assigned from 0 % (inefficient) to 100 % (efficient) during the observation period from 2007 to 2012, Indonesia Stock Exchange (IDX)-listed State-Owned Firms (SOFs; 98.16 %) ranked the highest, followed by foreign firms (97.90 %), non-IDXlisted private firms (88.22 %), IDX-listed private firms (84.65 %), and non-IDX-listed SOFs (62.89 %) with average scores being 87.07 %. No statistical difference in efficiency was found between those IDX-listed and those not. This paper accordingly encourages immediate actions of far below-average national firms to improve their efficiency for especially facing the verge of the 2015 ASEAN free trade era.