The purpose of this study was to examine the relationship between school principals' instructional leadership and collaborative culture in schools. The study was conducted using a cross-sectional survey with a sample of 382 teachers. The data were collected through the Principal Instructional Management Rating Scale (PIMRS) and the School Culture Survey. Multiple regression analysis was used to estimate relationships among the variables. The study findings indicate that instructional leadership practices were significantly and positively related to collaborative culture in schools. The findings are discussed according to the related literature, and suggestions are made for policy and practice.