Sinclair is a suburb of Esperance and a locality of the Shire of Esperance in the Goldfields-Esperance region of Western Australia. Esperance Senior High School is located in Sinclair.

Sinclair is on the traditional land of the Njunga people of the Noongar nation. The Njunga were previously part of the Wudjari Noongar, but separated from them^[when?] for cultural reasons.^{[improper synthesis?]}