Tujuan penelitian ini adalah untuk menganalisis pengaruh: (1) supervisi kepala sekolah terhadap disiplin guru SMK Negeri se Kabupaten Lampung Tengah, (2) etos kerja terhadap disiplin guru SMK Negeri se Kabupaten Lampung Tengah, (3) supervisi kepala sekolah terhadap etos kerja guru SMK Negeri se Kabupaten Lampung Tengah.Jenis penelitian ini berdasarkan tujuannya termasuk penelitian eksplanatif, karena ingin menjelaskan hubungan pola-pola yang berbeda tetapi ada keterkaitan serta menghasilkan pola hubungan sebab akibat. Dalam hal ini Supervisi kepala sekolah sebagai variabel bebas ( X1 ) berpengaruh terhadap disiplin guru sebagai variabel terikat ( Y ), dan Etos kerja sebagai variabel bebas ( X2 ) berpengaruh terhadap disiplin guru sebagai variabel terikat ( Y ).Berdasakan hasil penelitian disimpulkan: (1) supervisi kepala sekolah berpengaruh signifikan terhadap disiplin guru. (2) Etos kerja berpengaruh terhadap disiplin guru. (3) supervisi kepala sekolah berengaruh terhadap Etos kerja.

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The purpose of the study is to analyze the influence of: (1) the principal supervision towards the discipline of all teachers of State Vocational High School s in Central Lampung Regency, (2) Working Ethos towards the discipline of all teachers of State Vocational High School s in Central Lampung Regency, (3) the principal supervision towards the work ethos of all teachers of State Vocational High School s in Central Lampung Regency.This research is a quantitative research. Based on its purpose of this research belongs to explanative research because it explains the relationship of the different patterns, but there is relationship and produces the pattern of casual relationships. In this case the principal?s supervision is as the independent variable (X1) and work ethos as the independent variable (X2) determine towards the teachers discipline as the independent variable (Y).The result of the study shows: (1) the principal supervision significantly effects towards the discipline of teachers, (2) Work ethos significantly effects towards teachers discipline, and (3) principals supervision significantly effects towards work ethos. And (4) principals supervision and work ethos significantly effects alltogether towards the discipline of teachers.