待售剧本（spec script，speculative screenplay）是指非因受到委托由而由作者自行撰写的剧本。待售剧本通常是由希望剧本能被制作人、制片公司或制片厂纳入考量或买下的编剧所撰写。

曾获得奥斯卡金像奖的待售剧本包括：《末路狂花》（卡莉·克里撰写，由米高梅在1990年以50万美元买下）、《心灵捕手》（麦特·戴蒙和班·艾佛列克撰写，由米拉麦克斯影业在1994年以67.5万美元买下），以及《美国心玫瑰情》（艾伦·鲍尔撰写，由梦工厂在1998年以25万美元买下）。

A spec script, also known as a speculative screenplay, is a non-commissioned unsolicited screenplay. It is usually written by a screenwriter who hopes to have the script optioned and eventually purchased by a producer, production company, or studio.

Spec scripts which have gone on to win Academy Awards include: Thelma & Louise (sold by Callie Khouri to MGM for US$500,000 in 1990); Good Will Hunting (sold by Matt Damon and Ben Affleck to Miramax Films for US$675,000 in 1994); and American Beauty (sold by Alan Ball to DreamWorks SKG for US$250,000 in 1998).