A ranar 11 ga Nuwamba, 2013, an tabbatar da cewa Bottas zai ci gaba da Williams-Mercedes a 2014 tare da Felipe Massa, wanda aka sanya hannu daga Ferrari don maye gurbin Pastor Maldonado. A tseren farko na kakar 2014 a Ostiraliya, Bottas ya cancanci 10th kuma ya gama 6th, bayan ya dawo daga hadari a farkon tseren. Daga baya an daukaka shi zuwa na 5 bayan an cire Daniel Ricciardo daga matsayi na 2. A gasar, Bottas ya cancanci na biyu, mafi kyawun sa a cikin Formula One kuma ya sami nasararsa ta farko a cikin wasan, ya gama na uku a bayan Nico Rosberg (na 1) da Lewis Hamilton (na 2). Duk da cancanta na 14 a kan grid a gasar, Bottas ya zargi ta hanyar filin don kammala na biyu, bayan da Rosberg ya yi ritaya daga tseren, don haka ya sami nasararsa ta biyu a jere. A gasar, ya cancanci na biyu kuma ya gama tseren a matsayi guda duk da kalubalen da Hamilton ya yi. Bayan samun karin mukamai uku a Belgium,
Rasha (inda ya kafa saurin sa na farko na tsere) da Abu Dhabi (wani ɓangare na rukunin Williams na farko da aka samu sau biyu tun daga Grand Prix na Monaco na 2005), Bottas ya gama na 4 a gaba ɗaya a Gasar Drivers, ya doke masu son tsohon zakaran duniya Sebastian Vettel da Fernando Alonso.