The Spanish and Portuguese Synagogue of Montreal, also known as Shearith Israel, is an Orthodox synagogue, located at 4894 Avenue Saint-Kevin in Snowdon, Montreal, Quebec, Canada. The synagogue is the oldest Jewish congregation in Canada. The congregation traces its history from 1760 and was formally established in 1768. It is affiliated with the Orthodox Union.

Synagogues may be considered "oldest" based on different criteria, and can be oldest in the sense of oldest surviving building, or oldest in the sense of oldest congregation. Some old synagogue buildings have been in continuous use as synagogues, while others have been converted to other purposes, and others, such as the Touro Synagogue, were shuttered for many decades. Some early established congregations have been in continuous existence, while other early congregations have ceased to exist.