ABSTRACT This cross‐sectional study aimed to examine the relationship between fathers' e‐health literacy levels and their effects on breastfeeding. This descriptive and correlational study was performed with a sample of 324 fathers. The data were collected using the Descriptive Information Form, the e‐Health Literacy Scale (e‐HEALS), and the Partner Breastfeeding Influence Scale (PBIS). The data were analyzed using numerical values, percentages, means, standard deviations, minimum–maximum values, Pearson correlation analysis, and linear regression analysis. Fathers showed adequate e‐health literacy (28.2 ± 5.6) and moderately high breastfeeding support (117.8 ± 22.5). The number of children and the educational status of fathers and mothers affected e‐HEALS scores; the educational status of fathers and mothers, economic status, mother's employment status, number of children, and mode of delivery affected PBIS scores. In addition, fathers with higher e‐HEALS scores had higher PBIS, helping, and breastfeeding presence scores. Nurses and midwives should be aware of the significant relationship between fathers' e‐health literacy levels and its effects on breastfeeding. Raising fathers' awareness about e‐health literacy levels may enhance their support to mothers during lactation.