Pregnancy is a highly demanding period for nutrition demand, this period includes the taking of additional intake of nutritious foods which results in weight gain of about 10-12kg during pregnancy. Foods rich in Fiber like whole grains pulses, proteins and water should be taken during pregnancy. Objective: The study aimed to determine the dietary patterns and related knowledge among primigravida women of 1st trimester (1-12 weeks) during pregnancy. Methods: The study adopted an exploratory survey design that was conducted at O.P.D Kamla Nehru Hospital, Shimla, Himachal Pradesh in the month of February-March 2019. A total of 400 primigravida women of 1st trimester (1-12 weeks) were selected by purposive sampling technique and after collecting the data from the subjects Informational booklets were given to the subjects, the dietary patterns and related knowledge during pregnancy was assessed by using Self-structured questionnaire and interview technique was used to collect data. Result: Data analysis was done with descriptive and inferential statistics. Frequency and percentage were used to analyze the socio-demographic profile of the subjects. Mean and Standard Deviation was used to analyze the dietary patterns of Primigravida women of 1st trimester (1-12 weeks).A chi-square test was used to find the association between the knowledge regarding dietary patterns with the selected socio-demographic variables.28 close-ended questions were asked from the 400 subjects. 57% of the study subjects have good dietary patterns, 42.3% have average dietary patterns and 0.7% has poor dietary patterns. The majority of (61.3%) antenatal women had Moderate knowledge, (11.7%) had adequate knowledge and (27%) had inadequate knowledge regarding diet during the antenatal period. The significant association found between knowledge score of that antenatal women's Sources of information regarding diet (0.031*) were found significant with other socio-demographic variables. No other significant association was found with other socio-demographic variables. Conclusion: The results of the present study reveal that there is a lack of knowledge and practices among primigravida women of 1st trimester (1-12 weeks) during pregnancy hence women's knowledge needs to shift the care at the earliest to prevent further complications during pregnancy.