Foss (c. 1873 – 26 November 1887), formally named Aderphos, was the pet cat of Edward Lear, the 19th-century author, artist, illustrator and poet.

A "stumpy-tailed," "portly," and "unattractive" tabby cat, he was a favourite of Lear's and played an important role as a companion in the poet's lonely later years.

[8] Foss is said to have been the model for the pussycat in Lear's "The Owl and the Pussy-Cat" illustrations, though he chose to depict a full-length tail.

[17] Foss was buried under his own headstone – with an epitaph composed by Lear – beneath a fig tree in the garden at Villa Tennyson.

[15] Foss is mentioned in the song "Mr Lear" by British folk singer Al Stewart on his 2005 album A Beach Full of Shells.