ABSTRACT Adolescence is a crucial period marked by rapid growth and development, necessitating heightened attention to nutritional needs. However, adolescent females, particularly in low- and middle-income countries, often face challenges related to malnutrition and poor diet quality. This study assesses the nutritional status and diet quality of female adolescents in selected government secondary schools in Odeda Local Government Area, Ogun State, Nigeria. A descriptive cross-sectional design was employed, involving 250 respondents selected through multistage random sampling. Data on socio-demographic characteristics, anthropometric measurements, and dietary intake were collected through questionnaires. The findings revealed that most respondents were in the late adolescence stage with notable variations in parental income, indicating potential economic improvements. A prevalent issue was the high proportion of overweight cases among respondents, coupled with suboptimal dietary diversity and excessive consumption of carbohydrate-rich foods. Additionally, significant deficiencies in essential nutrients such as Vitamin A, fiber, calcium, and vitamin C were observed. Recommendations stemming from this study include intensified efforts to promote the consumption of fruits, vegetables, and fiber-rich foods, possibly through school-based or community initiatives. Health promotion campaigns targeting the reduction of empty calorie consumption are warranted.