Background:  Cardiac  arrest   kills  many  people  in the  world.  Major  concern  is  the  lack  of  awareness  about  CPR  among  health care  professionals.  The  present  study  is  conducted   to  improve  the  knowledge  of  student  nurses  regarding  CPR  through  planned  teaching  program. Aim:  Evaluate  the  effectiveness  of  teaching   programme  on  knowledge  regarding  CPR  among  student  nurses.  Methodology:  A  pre–experimental  one  group  pre–test  post–test  design  was  used.  40  student  nurses  were  selected  using  consecutive  sampling  technique.  The  pre–test  was  evaluated  by  knowledge  questionnaire.  Post–test  was conducted after 8 days  of  teaching. Data  was  analyzed  using descriptive and inferential statistics.  Result:  The findings revealed that  mean value of pre–test was 17.1 with SD of 6.14 and post–test mean value was 25.6 with SD of 9.30. The  calculated  ‘t’  value  was  18.89  and  it  was statistically  significant  at  p<0.05  level.  There  was  significant  increase  in  knowledge  after  teaching.  Conclusion:  The  study concluded  that  planned  teaching  program  was  an  effective  tool  in  improving  the knowledge  regarding  CPR.