Kanimblan orogeny was a mountain-building event in eastern Australia toward the end of Early Carboniferous time (about 318 million years ago). It was a terminal orogeny episode forming the Lachlan Fold Belt, also called Lachlan Geosyncline before the advent of the plate tectonics theory.
Uplift and deformation occurred in a 1000 km belt extending from Tasmania to Cape York. However the original width was 2000 to 3000 km wide, with the excess size absorbed by folding and thrusting.
Kanimblan orogeny also affected the Tasman Geosyncline, which is aligned in parallel with Kanimblan orogeny.