A substantial increase in Type 1 Diabetes Mellitus (T1DM) has been reported globally among children following the discovery of COVID-19. This study reports a similar trend among Nigerian children. A twelve-year (2010-2021) retrospective review of T1DM cases admitted in the Paediatric wing of a tertiary hospital in South-East Nigeria. During the twelve-year study, 21 T1DM patients were seen: 9 (43%) males and 12 (57%) females. Approximately 60% of these cases presented during the pandemic (2020-2021). The mean age of subjects with T1DM was 10.5 ± 4.1 years, with females being slightly older than the male subjects (11.6 ± 3.7 years vs 9.2 ± 4.3 years respectively; p=0.176). Prior to the pandemic, females were significantly older than males (11.6 ± 3.7 years vs 4.5 ± 2.1 years respectively; p=0.042), but no age difference was observed during the pandemic (11.6 ± 4.1 years vs 10.4 ± 3.9 years respectively; p=0.597). 80% of all males in this study were seen during the pandemic and were older than the males seen before the pandemic (10.4 ± 3.9 years vs 4.5 ± 2.1 years; p=0.078). Following adjustments for age and gender, older children and males had an increased odd of developing T1DM during the pandemic but this was not statistically significant. This study highlights the need for increased awareness and high index of suspicion of T1DM among children during this pandemic. In the interim, more robust multi-centre studies are required to investigate the underlying relationship between COVID-19 and T1DM.