School-aged children have high nutrient requirements to support continued growth and development, making adequate nutrition essential during this life stage. The recent release of data from the 2023 National Nutrition and Physical Activity Survey (NNPAS) provides an opportunity to assess micronutrient intakes among Australian school-aged children. This study aimed to assess usual micronutrient intakes and the prevalence of inadequate and excessive micronutrient intakes among Australian school-aged children, compare micronutrient intakes between school and non-school days, and identify sociodemographic factors associated with micronutrient intakes. Dietary intake data from 1066 children aged 5-12 years participating in the 2023 NNPAS(1) were analysed. Dietary intake was assessed via up to two non-consecutive 24-hour recalls. Usual dietary intake was determined by the Multiple Source Method. The prevalence of inadequate micronutrient intakes was estimated using the Estimated Average Requirement cut-point method, except for iron, for which the full-probability method was used. Excessive intakes were assessed against the Upper Level of Intake (UL). Linear regression was used to assess differences in micronutrient intakes between school days and non-school days, and to examine associations between micronutrient intakes and sociodemographic characteristics. All analyses accounted for the complex survey design. Calcium was the nutrient of greatest concern, with inadequate intakes increasing from 18.4% among 5-8-year-olds to 57.3% among 9-11-year-olds and 82.5% among 12-year-olds. Among 9-12-year-olds, inadequate intakes of vitamin B6 (27.2%), phosphorus (20.4%), vitamin A (11.8% of boys; 18.9% of girls), riboflavin (7.1%), and iron among girls (6.5%) were observed, while 8.2% of 5-8-year-olds had inadequate iron intakes. Intakes above the UL were common for niacin (97.8%-99.3%), sodium (75.2%-93.8%), and folate (56.2%-88.4%) among children aged 5-12 years, while 8.1% of children aged 5-8 years had vitamin A intakes above the UL. After adjustment for age, sex, energy intake, and parental education, micronutrient intakes did not differ significantly between school and non-school days (all p > 0.05). Multivariable analyses adjusted for energy intake identified several sociodemographic correlates of micronutrient intake (all p < 0.05). Older age was associated with lower riboflavin, folate and calcium intakes, but higher niacin and sodium intakes. Girls had lower intakes of riboflavin, niacin, iron and phosphorus than boys. Moderate food insecurity was associated with lower folate intakes. Children with a parent born in a non-English-speaking country had lower folate and sodium intakes, while those with a parent born in an English-speaking country other than Australia had lower vitamin A intakes. Larger household size was associated with lower vitamin A intakes. Australian children aged 5-12 years experience both inadequate and excessive micronutrient intakes, indicating that current dietary patterns may not support optimal nutrition. Public health strategies should prioritise improving micronutrient intakes while addressing the needs of population subgroups with differing intake patterns.