The purpose of this study is to survey Japanese senior high school English teachers' awareness of their communication strategy (CS) use in English and also their perceptions of the need for teaching CS use to their students. Using a 5-point Likert scale, the questionnaire items were made based on the CS list of Celce-Murcia, Dörnyei and Thurrell (1995). Each question item has three component factors: (1) how often they use a particular CS as a language user; (2) how important they feel it is to teach it to their students as a language teacher; and (3) whether they teach it to their students explicitly in class. The survey was conducted in February and March of 2007, and 120 high school teachers participated in it. Some of the major findings are: (1) the above three component factors are closely related to one another; (2) explicit CS training is not practiced in class as much as expected. Comments on CS use and instruction made by 39 teachers were also summarized. Lastly three pedagogical suggestions are made to improve the strategic competence of Japanese high school students.