The Technological Leadership Behavior Instrument for School Principal (TLBISP) was developed and validated to examine technological leadership behaviors of secondary school principals in the use of technology by teachers according to secondary school teachers' views. The content and construct validity were ensured, and the internal consistency and reliability coefficients were calculated. While the sample of Explanatory Factor Analysis (EFA) consisted of 308 teachers, Confirmatory Factor Analysis (CFA) consisted of 240 teachers from the secondary schools in Mamak district of Ankara city in the spring semester of the 2017-2018 academic year. While EFA showed four-factors with 24- items structure, the CFA showed 18-items with four-factors which called as motivation, orientation, precaution, and support. CFA showed that model fit indices (such as goodness-of-fit) values were acceptable. Cronbach Alfa coefficient value was 0.72, and Pearson coefficients of factors were between 0.22 and 0.60. In conclusion, TLBISP is a valid and reliable measurement instrument.