This study investigates the multidimensional nature of gender inequality across Nigeria’s 36 states and theFederal Capital Territory, focusing on disparities in political representation, educational attainment, andlabour force participation. By employing gender ratios and composite indicators such as the GenderInequality Index (GII) and Gender Equality Index (GEI), the analysis reveals entrenched structural disparities.Political representation exhibits the greatest imbalance, with a national average gender ratio of only 9.78%,ranging from 16.8% in the South East to 4.41% in the North West. Educational attainment records a higheraverage gender ratio of 69.79%, but significant regional inequities persist, especially in the North West andNorth East. Labour force participation presents a nuanced picture, with higher female ratios in some northernstates but without corresponding educational or political inclusion. The analysis further reveals significantheterogeneity across states, as evidenced by a high τ² of 128,239,554.78 and I² of 99.96%, indicatingsystemic, rather than random, variability. The GII highlights pronounced disparities, with values ranging from18,177 in Sokoto to 213,992 in Enugu. Using random-effects meta-analysis, correlation matrices, choroplethmaps, radar charts, and ratio-based plots, the study provides a comprehensive visual and statisticalunderstanding of gender gaps. Key policy recommendations include enforceable gender quotas, educationto-employment pathways, regional strategies, robust gender data systems, civic awareness campaigns, legalreforms, and digital/financial inclusion initiatives. The findings call for integrated, data-driven, and contextsensitivepolicies to advance SDGs 5 and 10 and promote inclusive national development.