<p>Geochemical analysis of sediment samples from the Lekki Lagoon was carried out to provide evidence for provenance, chemical weathering conditions and tectonic settings. Following sample digestion, Inductively Coupled Plasma Emission Spectroscopy (ICP-ES) and Inductively Coupled Plasma Mass Spectroscopy (ICP-MS) were subsequently employed for the quantification of major and trace elements respectively. Higher Al/Si ratios in Lekki Lagoon Sediments (LLS) were observed in mud-rich sediments, whereas the non-cohesive fine- to medium-grained sands are enriched in silica due to lower Al/Si ratios. Geochemical characterization indicates that the sediments are predominantly comparable to quartz arenite and litharenite, with a few samples resembling subarkose and sublitharenite. They display a broad spectrum of compositional maturity, ranging from low to very high. The plagioclase index of alteration (PIA) and chemical index of alteration (CIA) indicate that most LLS samples originated from moderately to strongly weathered silicate sources. However, the inclusion of the Fe and Mg (FM) constituents in the ternary plot expressed as A-CNK-FM indicated weak to strong chemical weathering. The geochemical discrimination diagrams collectively suggested that the Lekki Lagoon sediments (LLS) were predominantly derived from felsic to andesitic source rocks, with compositional signatures pointing to a passive margin setting. Minor but notable contributions from continental island arc sources indicated a mixed provenance influenced by multiple tectonic regimes.</p>