QSound is the original name for a positional three-dimensional (3D) sound processing algorithm made by QSound Labs that creates 3D audio effects from multiple monophonic sources and sums the outputs to two channels for presentation over regular stereo speakers.

QSound was eventually re-dubbed "Q1" after the introduction of "Q2", a positional 3D algorithm for headphones. When multi-speaker surround system support was later added to the positional 3D process,