For information on the German rock band from Hamburg see One Fine Day (band)

One Fine Day is a 1996 romantic comedy starring Michelle Pfeiffer and George Clooney. The film is about a hectic day that gradually transforms the mutual antagony between two single working parents - a feisty architect (Pfeiffer) with a son, and a snide political columnist (Clooney) with a daughter - into love. The title comes from the 1963 song "One Fine Day" by The Chiffons.

George Phillips, a middle-aged Londoner, works as an estate agent for the firm of Frobisher, Rendell and Ross. His home life is soured by clashes with his wife over whether their teenage son's girlfriend should be allowed to sleep over at their house, a situation the timid, melancholic George dislikes but hasn't the guts to forbid. His professional life is dominated by his attempts to find a buyer for Sunley House, a once-fashionable 1960s office block which has lain unoccupied for over a year. When his wife leaves for Colchester to look after her elderly father, George avoids conflict with his son by sleeping over at Sunley House. Meanwhile, his workplace rival, a younger man called Rycroft, is also trying to find a buyer for Sunley House (and thereby usurp George's place in the firm). One morning George finds himself locked in and has to crash through a window to escape. When Rycroft finds the broken window, he sets out to find the culprit. Written by Peter Brynmor Roberts

Melanie Parker, an architect and mother of Sammy, and Jack Taylor, a newspaper columnist and father of Maggie, are both divorced. They meet one morning when overwhelmed Jack is left unexpectedly with Maggie and forgets that Melanie was to take her to school. As a result, both children miss their school field trip and are stuck with the parents. The two adults project their negative stereotypes of ex-spouses on each other, but end up needing to rely on each other to watch the children as each must save his job. Humor is added by Sammy's propensity for lodging objects in his nose and Maggie's tendency to wander. Written by John H. Henderson