Eupithecia casloata is a moth in the family Geometridae. It is found in North America, including Yukon, British Columbia, Alberta, Saskatchewan, New Brunswick, Newfoundland and Labrador, Quebec, Washington, Montana, Oregon, Wyoming, Colorado, Utah, California, Maine and New Hampshire. The wingspan is about 16 mm. The forewings are alternately banded with irregular light and dark bands. The hindwings are largely pale, with a broad smoky marginal band.