Introduction: Dengue fever is one of the most common vectors borne viral infection. Dengue cases are found to be raising globally and thus they are increasing threat to human kind. Each year the cases of Dengue fever and the mortality rate are increasing. The aim of the present study is to assess the effectiveness of planned teaching programme on knowledge regarding Dengue fever among the first year BSc Nursing students of selected college at Mangalore.

Objectives: To assess the pre-test and post test level of knowledge regarding Dengue fever among first year BSc Nursing students as measured by structured knowledge questionnaire. To evaluate the effectiveness of planned teaching programme on knowledge regarding Dengue fever among first year BSc Nursing students in terms of gain in mean post test knowledge score.

Methodology: An evaluative approach was used for the study. The sample comprised of 60 students of 1^stYear BSc Nursing, random sampling was used to select the sample for the study and structured knowledge questionnaire was administered to collect the data. The data was analyzed by using descriptive and inferential statistics.

Results: The mean post knowledge score obtained by the first year BSc students (17.6) were higher than mean pre-test knowledge score (11.4) paired ‘t’ test was done to find out the difference between mean pre-test and post-test knowledge score and statistically it was highly significant (t=35, P<0.05). There was no significant association between the mean pre-test knowledge scores.