Improved lost circulation compositions that include melt-processed inorganic fibers and methods for using such compositions in subterranean formations are provided. An example of a method of the present invention is a method of cementing in a subterranean formation. Another example of a method of the present invention is a method comprising providing a cement composition that comprises cement, water, and a plurality of melt-processed inorganic fibers, the melt-processed inorganic fibers having a mean aspect ratio of greater than about 25, a specific gravity of greater than about 1.2, and a length of less than about 10 millimeters; introducing the cement composition into a well bore that penetrates a subterranean formation; and allowing the melt-processed inorganic fibers to at least partially prevent fluid loss from the cement composition into the subterranean formation. An example of a composition of the present invention is a cement composition for use in a subterranean formation.