Carex backii, commonly known as Back's sedge, is a species of sedge (Carex) in the section Phyllostachyae. First described scientifically in 1839 by American botanist Francis Boott, it is found in Canada and the United States, where it grows in shaded woods, shaded slopes, and shrub thickets.
The plants have culms that grow high, and deep-green to yellowish-green leaves measuring 2âÂÂ5 mm wide. The inflorescence is typically a single terminal spike lacking a spike bract.