The present disclosure relates to inserts for use with sandwich panels, such as composite panels, and related methods. Presently disclosed inserts may include a retention feature and/or an anti-rotation feature that may be configured to retain the insert in place within a bore formed in the sandwich panel. In this manner, presently disclosed inserts may be secured without the use of adhesive compounds, which may increase efficiency and/or reduce costs in manufacturing apparatus that include one or more sandwich panels having one or more inserts placed therein. Presently disclosed methods of installing an insert into a sandwich panel may include rotating the insert with respect to the sandwich panel as the insert is installed, such that a portion of the insert may be positioned under the skin of the sandwich panel (e.g., a portion of the insert may be positioned between the skin and the core of the sandwich panel).