PbS quantum-dot-doped glasses are demonstrated as saturable absorber Q-switches for 2\mu \text{m} holmium lasers. Q-switched pulses from {\text{Ho}}^{\text{3}+}:{\text{Y}}_3{\text{Sc}}_2{\text{Al}}_3{\text{O}}_{12} and {\text{Ho}}^{\text{3}+}:{\text{Y}}_3{\text{Al}}_5{\text{O}}_{12} lasers of 50 and 70\text{\hspace{0.17em} \hspace{0.17em} ns} in duration, respectively, have been obtained demonstrating up to 13\% of energy conversion efficiency from free-running to Q-switched output.