Monolayer tungsten disulfide (WS₂), a typical member of the semiconducting transition metal dichalcogenide family, has drawn considerable interest because of its unique properties. Intriguingly, the edge of WS₂ exhibits an ideal hydrogen binding energy, which makes WS₂ a potential alternative to Pt-based electrocatalysts for the hydrogen evolution reaction (HER). Here, we demonstrate for the first time the successful synthesis of uniform monolayer WS₂ nanosheets on centimeter-scale Au foils using a facile, low-pressure chemical vapor deposition method. The edge lengths of the universally observed triangular WS₂ nanosheets are tunable from ∼100 to ∼1,000 nm. The WS₂ nanosheets on Au foils featuring abundant edges were then discovered to be efficient catalysts for the HER, exhibiting a rather high exchange current density of ∼30.20 μA/cm² and a small onset potential of ∼110 mV. The effects of coverage and domain size (which correlate closely with the active edge density of WS₂) on the electrocatalytic activity were investigated. This work not only provides a novel route toward the batch-production of monolayer WS₂ via the introduction of metal foil substrates but also opens up its direct application for facile HER.