The scientific approach constitutes an approach to Indonesia's 2013 curriculum. Since it is imperative for Indonesian education, all teachers need to understand, take control, and apply it in teaching-learning processes. Unfortunately, many teachers particularly English teachers, still use inappropriate methods as in the 2013 curriculum. This qualitative research aims at discovering the implementation of scientific approach by English teachers at State Senior High School in Lhokseumawe. The objects were an English teacher at SMAN 1 Lhokseumawe, an English teacher at SMAN 2 Lhokseumawe, and an English teacher at SMAN 5 Lhokseumawe. The tools used in this study were observation for three high school English teachers in the schools. The observation results toward the implementation of five scientific approach stages exposed that the English teachers did not carry out the five stages completely. The teacher should master, understand, and able to carry out the teaching process by following the whole stages of the scientific approach. Class mastery and time management are vital in the learning process, thus, the teachers should consider those points.Besides that, interesting supporting media and appropriate learning material andmethods must be considered by the teachers in teaching so that the students will be motivated to learn.