EIEIO
# EIEIO

EIEIO may refer to:

* The refrain to the children's song, "Old MacDonald Had a Farm"
* Enforce In-Order Execution of I/O, a machine instruction used on the PowerPC computer processor
* Computer bought the farm, an error message with symbol EIEIO, from the GNU Hurd operating system
* EIEIO, the Enhanced Implementation of Emacs Interpreted Objects, an object-oriented elisp system based on the Common Lisp Object System
* "E-I-E-I-O", an episode of Barney & Friends from the fourth season of the show
