This study was designed to examine online information-seeking behaviours of expectant fathers regarding pregnancy and birth and their antenatal anxiety. The present study was conducted using 120 expectant fathers who accompanied their wives to the maternity outpatient clinic in western Turkey, İzmir Province. The fathers' anxiety levels were assessed using a trait anxiety subscale of the State-Trait Anxiety Inventory (STAI), which is a validated test for scoring trait anxiety (basal anxiety, STAI-T). The results showed that 92.5% of the expectant fathers searched for information online during pregnancy. They most frequently searched for the following topics: foetal development, complications to pregnancy and nutrition. The mean total trait anxiety scale score of the expectant fathers was 47.35 ± 6.98 (range = 31-62). The anxiety scores of the expectant fathers who searched for information on topics related to vaccination during pregnancy, exercise, antenatal tests, labour pain and childbirth signs were high. Health professionals should consider the information needs and concerns of expectant fathers during pregnancy while providing family-centred care.