of Speculation is a 2014 novel by American author Jenny Offill.

The novel received positive reviews, and has been compared to Offill's later work, Weather.

of Speculation eschews a typical plot, which Offill has said was deliberate.

[5][6] In her review of the book, published by NPR, Meg Wolitzer praised the novel as "[...] intriguing, beautifully written, sly and often profound".

of Speculation was shortlisted for 2015 PEN/Faulkner Award for Fiction,[9] and the Folio Prize.