Tesis ini melakukan pengukuran efisiensi Unit Usaha Syariah Bank Umum Pemerintah Nasional dan Bank Umum Swasta Nasional diperoleh dengan mengestimasi fungsi profit perbankan dan menghitung rasio BOPO. Secara teoritis, dengan mengestimasi fungsi profit, dapat diukur profit maksimum yang seharusnya diperoleh dari hasil input dan output yang digunakan. Dari hasil estimasi fungsi profit tersebut, kemudian dihitung error term dari fungsi tersebut dengan menggunakan metode Stochastic Frontier Analysis (SFA). Kemudian hasil tersebut dapat menggambarkan kondisi Unit Usaha Syariah Bank Umum Pemerintah Nasional dan Bank Umum Swasta Nasional. Hasil penelitian menunjukkan bahwa rata-rata efisiensi Unit Usaha Syariah dari Bank Umum Pemerintah Nasional dan Bank Umum Swasta Nasional yang diukur dari metode SFA maupun BOPO untuk periode 2005 sampai 2007 tidak berbeda secara signifikan.

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This research performs efficiency measurement of Islamic Banking Units (Unit Usaha Syariah) of National Public Commercial Banks and National Private Commercial Banks by estimating banking profit function and Operating Expenses to Operating Income Ratio (BOPO). Theoretically, the maximum profit, which is essentially obtained from the input and output employed, can be measured by estimating the profit function. After getting the result of the profit function estimation, its error terms are calculated by using Stochastic Frontier Analysis (SFA). The outcome will then be able to describe the condition of Islamic Banking Units of National Public Commercial Banks and National Private Commercial Banks. The result of this research shows that the efficiency average of Islamic Banking Units of National Public Commercial Banks and National Private Commercial Banks measured by using SFA method and Operating Expenses to Operating Income Ratio taken from 2005 to 2007 is not significantly different.