Redia

Redia or redia may refer to:
 * A synonym for the plant genus Cleidion, of the family Euphorbiaceae
 * A stage in the development of a trematode
 * A dipstick for urinalysis, determining levels of glucose, albumin and erythrocytes
 * An Italian zoological journal, named after Francesco Redi, started in 1903 and currently published by the Research Centre for Agrobiology and Pedology (ABP) of the Agricultural Research Council (CRA)