Cutting elements for earth-boring tools include a substrate having a front end surface, an opposing back end surface, and at least one side surface extending between the front end surface and the back end surface. A volume of polycrystalline hard material is disposed on the front end surface of the substrate. The substrate and polycrystalline hard material may have a curved or an annular configuration defining an aperture within the cutting element. Earth-boring tools include such cutting elements. Methods of forming earth-boring tools include attaching such one or more such cutting elements to a body of an earth-boring tool.