This study aimed at investigating the impacts of the COVID-19 pandemic period on the language development of preschool children according to the opinions of teachers. A qualitative case study design was adopted, with data obtained from preschool teachers (N=21) working in independent kindergartens, kindergartens within primary schools, and private kindergartens affiliated with the Ministry of National Education, Turkey. Owing to the difficulties of reaching teachers and conducting face-to-face interviews during the pandemic, an easily accessible online sampling and data collection method was adopted. A personal information form and open-ended question form developed by the researchers were used to obtain the research data for a content analysis technique. Teachers stated that the language development of children was adversely affected during the pandemic period, and they observed developmental delays in verbal language and social communication skills.