Background: Gingivitis which occurs in children age pubertal at 12-13 years influenced by the hormonal of puberty, in addition the conditions of hygiene of the oral cavity can also affect the gingivitis in children the age of puberty. Goals: this research aims to know the relationship of the oral hygiene with the incidence of gingivitis in students age pubertal in SMP 3 Kasihan Bantul. Research method: this research using analytic survey research methods. Sample using a total sample as many as 114 grade VII SMP 3 Kasihan Bantul conducted an examination of the status of OHI-S index and status of gingivitis using OHI-S Index and Gingival Modiffication. Data analysis use korelation test by bivariat pearson. Research results: The test results is correlation rhitung of 0.441 more than rtabel α = 0.1535. Shows H0 is rejected, so there is a relationship between the oral hygiene with the incidence of gingivitis in students age pubertal in SMP 3 Kasihan Bantul. Conclusion: there is a relationship between the oral hygiene with the incidence of gingivitis in students age pubertal in SMP 3 Kasihan Bantul.