Leah on the Offbeat is a 2018 young adult novel by American author Becky Albertalli. It is the direct sequel to her 2015 debut novel Simon vs. the Homo Sapiens Agenda and the third novel in the "Simon-verse", the shared universe in which Albertalli's books take place and which also includes 2017's The Upside of Unrequited. The audiobook was read by actress Shannon Purser.