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Background Of The Study: According To The World Health Organization (Who): Mental Health Is A State Of Mental Well-Being That Enable People To Cope With The Stresses Of Life, Realize Their Abilities, Learn Well And Work Well, And Contribute To Their Community. The Who States That Mental Health Is “More Than Just The Absence Of Mental Disorders Or Disabilities.” Peak Mental Health Is Not Only About Managing Active Conditions But Also Looking After Ongoing Wellness And Happiness. Social And Financial Circumstances, Adverse Childhood Experiences, Biological Factors, And Underlying Medical Conditions Can All Shape A Person’s Mental Health. It Is Important To Know That Good Mental Health Depends On A Delicate Balance Of Factors And That Several Elements May Contribute To Developing These Disorders 1.The Mental Health Of College Students Is Evidenced A Growing Problem Globally. 2. After Graduating From Higher Secondary School Students Come Across With A Number Of Issues (E.G., Dormitory Life, Study Stress, Lack Of Time Management, Unhealthy Eating Habits, Sleeping Disorders, Smoking, Problematic Internet Usage, And Sedentary Behavior Etc,) In Their New Academic Setting 3. In This Period Of Transition, Students Are Struggling To Deal With An Intellectual And Social Hurdles Of University/Collage Studies, Which Is Essential For Their Preparation To Complete Their Professional Degrees With The Development Of Professional Knowledge, Skill And Experience. Statement Of The Problem: “A Study To Evaluate The Effectiveness Of Structured Teaching Programme On The Knowledge Regarding Mental Illness Among B.Sc. Nursing Students In Selected Colleges At Udaipur” Objectives Of The Study: To Assess The Pre-Test Knowledge Score Regarding Mental Illness Among B.Sc. Nursing Students. To Assess The Post-Test Knowledge Sore Regarding Mental Illness Among B.Sc. Nursing Students. To Determine The Effectiveness Of Structured Teaching Programme Regarding Mental Illness Among B.Sc. Nursing Students. To Find Out The Association Between Pre Test Knowledge Score With Socio Demographic Variables Regarding Mental Illness Among B.Sc. Nursing Students. Methods: The Pre Experimental Research Approach With One Group Pre And Post Test Design Is Used For The Present Study. The Sample Consist Of 100 B.Sc. Nursing Students Who Are Studying At Mass College Of Nursing And Udaipur Institute Of Nursing , Udaipur Which Is Selected By Purposive Sampling Technique. The Data Was Collected Prior To And After The Structured Teaching Programme By Self- Administered Structured Questionnaire. Results: The Mean Percentage Of The Overall Mean Pre-Test Knowledge Score Is 10.97 (34.43) And The Overall Mean Post-Test Knowledge Score Of Respondents Is 25.38 (82.33) The Overall Mean Difference Is 14.41 (48.43) With The T Value Of 29.43. Interpretation And Conclusion: The Obtained Data Is Analyzed By Using Descriptive And Inferential Statistics. Karl- Pearson Correlation Co- Efficient Test And Chi-Square Test. The Overall Mean Post Test Knowledge Score Of Respondents 25.38 (82.33) Is Higher Than The Overall Mean Pre Test Knowledge Score Of Respondents 10.97 (34.43) And Obtained T Value Is 29.43 With The Enhancement Of 14.41(48.43) Which Shows That Structured Teaching Programme Is Effective In Enhancement Of Knowledge Of B.Sc. Nursing Students On Mental Illness.