The spirit of nationality is one of the characters of students that must be developed through teaching and learning activities. The teachers' knowledge of the spirit of nationality and the implementation strategy is one of the keys to success in education. The objective of this study is to describe the extent of teachers' knowledge about the spirit of nationality. This study is a type of qualitative research with a phenomenological approach. The participants in this study included 25 public and private elementary school teachers from 8 provinces in Indonesia. The data was collected through focus group discussions (FGD) and interviews. The data analysis was carried out using Bogdan & Biklen's model. The FGD and interview analysis was intended to obtain information on 6 sub-themes; the teachers' knowledge about the character of the spirit of nationality, strategies to improve the character of the spirit of nationality, obstacles in applying the character of the spirit of nationality, the urgency of the character of the spirit of nationality compared to other characters, measurements and assessments used to evaluate the character of the spirit of nationality of students. The results of this study show that the teachers' knowledge of the spirit of nationality, strategies to improve the character of the spirit of nationality of students, and strategies to enhance the character of the spirit of nationality of students are still low. On the other hand, there is the fact that the teachers already understand the importance of the character of the spirit of nationality and its relation to learning by using various innovative models. In addition, the teachers can identify obstacles in improving and enhancing the character of the spirit of nationality of students. That way, the teacher will know what to do. So that learning will be innovative.