Introduction: The first five years of life constitute the foundations of the child's physical, mental growth and development. Mortality and morbidity are high during this age group. Early detection of danger signs is very crucial to prevent this. The objectives were to assess the knowledge of mothers regarding under-five danger signs and explore the association between the effects of knowledge with selected factors. Method: A descriptivestudy was conducted in a rural community of West Bengal from Jan’2018 to Sept’2018. Total study sample was 110 mothers having under five children. Door to door data collection was done through interview and data was analyzed both manually and by computer feeding. Results: Out of total study sample, majority (60%) belongs to age group 18-25 years followed by 31% among 26-33 age group, then 16% were more than 33 years. Out of total mothers, majority (40%) belongs to higher educated group, (37%) secondary group, followed by 10% with primary education and 13%were illiterate. Knowledge score was more than 50% among higher educated group (64%). Out of total respondents 61 (55.5%) mothers were not able to identify any danger signs whereas, 35.5 % mothers identified 1-2 danger signs and 9% mothers were able to identify 3-4 danger signs. Knowledge score about danger signs was more who visited antenatal clinic more than 4 times (61%). Conclusion: Awareness regarding under five danger signs are more among higher educated mothers. Number of antenatal visits also influences knowledge score.