Daddy Long Legs

English), an insect
Harvestman (Opiliones) (in North American English), an arachnid, but not a spider
Cellar spider (Pholcidae) (esp. in Australian/New Zealand English, but also North American English and U.K English), a true spider
Especially applied to Pholcus phalangioides

Fiction:
Daddy-Long-Legs (novel), a children's novel written in 1912 by Jean Webster.