Background: Anaemia is one of the most common nutritional deficiency diseases observed globally and it affects about a third of the world’s population. Anaemia in pregnant women is a worldwide public health concern that has severe consequences for both mothers and infants, including maternal death and foetal and infant mortality. In Low-income countries (LICs), 25% of indirect maternal mortality and 30% of neonatal deaths are due to anaemia in pregnancy. Therefore, this study aimed to determine the prevalence of anaemia and assess associated factors among pregnant women attending ante-natal care (ANC) clinic in the Kingdom of Eswatini, which might help for screening, prevention and treatment of anaemia and ultimately prevent its adverse effects. Method: A total of 550 pregnant women between 15 and 49 years from three health facilities were randomly enrolled using a cross-sectional study design, from January to March 2021. Non-probability sampling approach was used to select the appropriate study unit. A face-toface interview was done using a structured questionnaire to collect data. Multiple logistic regression was performed to assess the factors associated with anaemia among the women.Results: The overall anaemia prevalence among pregnant women was 43.1% (95% CI: 38.947.3). The mild, moderate and severe cases of anaemia were 21.3% (95%CI: 17.9-24.9); 21.1% (95%CI: 17.8-24.7) and 0.7% (95%CI: 0.2-1.9), respectively. The prevalence of anaemia was high among women aged 20-24 (11.1%, 95%CI: 8.6-14.0) and 25-29years (11.1%, 95%CI: 8.6-14.0). Factors associated with anaemia included living in the urban area (OR=1.8, 95%CI: 1.19-2.72, p=0.005) and having anaemia 6 months before pregnancy (OR=4.64, 95%CI: 1.1518.71, p=0.031). Additionally, gestational age at first ANC also was positively associated with anaemia: 3rd trimester (OR=10.42, 95%CI: 4.27-25.4, p<0.001) and 2nd trimester (OR=1.62, 95%CI: 1.02-2.60, p=0.043) Conclusion: Anaemia remains prevalent among pregnant women in Eswatini. Thus, a comprehensive anaemia prevention program would be justified and could lower the country’s burden of anemia.