<p>Transition-metal sulfide/carbon composites are the best and longest-lasting electrocatalysts for hydrogen and oxygen evolution reaction processes. Their unique combination of multiple active sites, tunable electronic structures, and strong carbon frameworks leads to an increase in catalytic activity, stability, and conductivity. In particular, the addition of transition-metal sulfides such as MoS₂, WS₂, CoSₓ, NiSₓ, and FeSₓ to carbon matrices makes the charge transfer process highly efficient and more ‍‌‍‍‌‍‌‍‍‌favorable during water splitting. Transition metal sulfides/carbon composites for electrocatalytic water splitting are a source of novel concepts for the rational design of high-performance ‍‌‍‍‌‍‌‍‍‌catalysts. This review paper provides a complete overview of recent innovations in the design, fabrication, and evaluation of electrocatalysts made from transition-metal sulfides and carbon composites. Along with discussing the primary synthesis methods, the paper also investigates the mechanistic insights that show the correlations between the structure and the activity. In the end, this review article summarizes shortly the challenges and the future research directions of transition metal sulfides/carbon composites. This article is quite different from other reports that generally cover broad materials surveys, as it focuses, is concise, and provides a mechanism-oriented angle on transition metal sulfide/carbon composites. This brief review provides fresh conceptual insights, applications, and relevant guidance, thus setting it apart from the previously published reviews on the same type of material systems.</p>