The use of waste iron dust as a partial sand replacement in concrete is gaining importance due to enhanced strength and environmental advantages. This research assesses the viability of integrating iron waste in varying proportions (5, 10, 15, and 50%) to improve concrete’s compressive strength. The mix design was established as M25 (1:2.19:3.71) to achieve the target compressive strength. A series of laboratory tests were performed to evaluate the influence of waste iron dust on concrete strength. Increasing iron filings in the concrete mix diminishes workability. A 15% substitution of fine aggregate with waste iron dust produces superior strength compared to traditional concrete mixtures. Conversely, a 50% replacement leads to a noticeable strength reduction. Consequently, findings indicate that iron filings enhance strength characteristics up to 15%, with a decline observed beyond 50%. This study, along with similar investigations globally, confirms the potential of using by-products like waste iron dust in concrete production. Such empirical observations may serve to motivate industrial producers and ecological institutions to persist in their endeavors related to the collection and regulation of these deleterious airborne particulates. Furthermore, a comprehensive analysis of life-cycle costs related to these alternative materials versus conventional concrete merits further investigation in future research.