Day (born April 16, 1957) is a former producer of video games.
She began her career in 1985, at Electronic Arts.
Day also worked for Accolade, Taito and LucasArts before founding Humongous Entertainment together with colleague Ron Gilbert.
She created the famous Putt-Putt series' eponymous protagonist as a bedtime story for her son, which later became a popular series of children's video games.
In 1999 she was listed on Time Magazine as one of the "Cyber Elite".
After leaving Humongous Entertainment in 2001, Day and Gilbert founded Hulabee Entertainment to provide online games for kids, with approximately 20 former Humongous Entertainment staff joining them.