John Ainsworth
John Ainsworth may refer to:
- John Ainsworth (by 1523-58/59), MP for Worcester
- John Ainsworth (Wisconsin politician), American politician
- Sir John Ainsworth, 1st Baronet, English industrialist, banker and Liberal politician
- John C. Ainsworth, American pioneer businessman and steamboat owner in Oregon
- Sir John Ainsworth, 3rd Baronet, see the Ainsworth baronets
- John Ainsworth (pilot), co-pilot of Jim Wallwork and one of the first Allied troops into France during the D-Day invasion
- John Ainsworth (producer), writer, director, executive, and producer for Big Finish Productions
- John Edgar Ainsworth, American polymath and NASA physicist
- John Dawson Ainsworth, British administrator in East Africa