The Sarnia Observer is a Canadian newspaper serving the city of Sarnia, Ontario. It is published six days a week, Monday through Saturday. The Sarnia Observer began publication in 1878 as The Evening Observer.

The Sarnia Observer is owned by Postmedia Network. It has a circulation of approximately 13,000 copies, and is the only daily newspaper in Sarnia.

The Sarnia Observer website address is http://www.theobserver.ca/. The website is written in both English and French.