jats:titleAbstract</jats:title> jats:pWe fabricate a free-standing few-layer molybdenum disulfide (MoSjats:sub2</jats:sub>)-polymer composite by liquid phase exfoliation of chemically pristine MoS2 crystals and use this to demonstrate a wideband tunable, ultrafast mode-locked fiber laser. Stable, picosecond pulses, tunable from 1,535 nm to 1,565 nm, are generated, corresponding to photon energies below the MoSjats:sub2</jats:sub> material bandgap. These results contribute to the growing body of work studying the nonlinear optical properties of transition metal dichalcogenides that present new opportunities for ultrafast photonic applications.</jats:p>