A toilet bowl system for use on-board an aircraft includes a toilet bowl body comprising a toilet bowl and a shroud. The toilet bowl has a rim. A removable splash guard is positioned between the toilet bowl and the shroud, and comprises a generally flat, flexible, planar shield having a central opening. The shield includes a top portion and a rear portion, the top portion faces the shroud and the lower portion faces the toilet bowl, and the lower portion is shaped to correspond with an upper portion of the rim of the toilet bowl and is configured to secure the removable toilet splash guard to the toilet bowl.