A possible way to promote sustainable and clean energy generation is the utilization of the water splitting procedure for photocatalytic hydrogen (H₂) production. Owing to its favorable band structure, chemical stability, and environmental friendliness, graphitic carbon nitride (g-C₃N₄) is an exceptional type of photocatalyst; however, its extensive use is hindered by its low photocatalytic activity. In order to address this issue, there has been considerable interest in mixing g-C₃N₄ with MXene-based 2D materials, owing to their high surface area, flexible surface chemistry, and higher conductivity. This report highlights current developments in g-C₃N₄/MXene nanocomposites for improved photocatalytic H₂ production. The structure, characteristics, and applications of type-II, Z-scheme, S-scheme, Schottky, and ternary heterojunctions, along with their photocatalytic H₂ evolution, are carefully examined. The synergistic effects of g-C₃N₄ and MXenes improve the photocatalytic efficiency by enabling effective charge carrier separation and electron transportation. In addition to structural optimization and interface engineering methods, important problems such as inadequate light absorption and charge carrier mobility are thoroughly discussed, along with the stability under long-term operation and advances in scalable applications. The novelty of this review outlines the potential commercial applications of g-C₃N₄/MXene-based systems in hydrogen generation, along with future directions in this area.