Schwartz's, also known as the Schwartz's Deli and the Montreal Hebrew Delicatessen, is a Jewish delicatessen restaurant and take-out, located on Saint-Laurent Boulevard in Montreal, Quebec, Canada. It was established in 1928, by Reuben Schwartz, a Jewish immigrant from Romania. Its long popularity and reputation has led to it being considered a cultural institution and landmark in Montreal.

Schwartz's signature dish is a smoked meat sandwich served on rye bread with yellow mustard. The meat is served by the fat content: lean, medium, medium-fat or fat. Medium and medium-fat are the most popular. According to journalist Bill Brownstein, the classic Schwartz's meal includes a medium-fat sandwich, fries, half-sour pickle, coleslaw, red pepper, and a black cherry soda.

The staff of Schwartz's credits the unique flavour of their smoked meat to their mandatory 10-day meat curing time, the high turnover of their meat, and their brick smoke-house covered with over 90 years' worth of buildup. Schwartz's has used an electric smoker for over 50 years since the city has banned wood smoking in restaurants. Montreal writer Mordecai Richler, in his novel Barney's Version, sardonically described the spices used in the smoked meat at Schwartz's deli as a "maddening aphrodisiac" to be bottled and copyrighted as "Nectar of Judea".

Schwartz's is also credited with creating Montreal steak seasoning or Montreal steak spice when Morris "The Shadow" Sherman, a broilerman working at Schwartz's in the 1940s and '50s, began adding the deli-smoked meat pickling spices to his own rib and liver steaks. It was so popular that it was copied by other Montreal delis and steakhouses.

Schwartz's is one of the few original delicatessen restaurants in Montreal still remaining, the others being Lester's Deli, Dunn's Famous Deli and Snowdon Deli. Other notable long-time Montreal smoked meat delicatessens, which competed with Schwartz's but have since closed include Bens De Luxe Delicatessen & Restaurant (1908–2006), The Brown Derby (1955–2000), Main Deli Steak House (1974–2023) and Quebec Smoked Meat (1950–2023). Schwartz's still prepares its smoked meat and other offerings mostly in-house, while Bens and Main Deli abandoned that in favor of ordering pre-cooked smoked meat from another company, in 1992 and 2013, respectively, a cost-saving measure that led to the decline of their food quality and likely resulted in their eventual closures.

Smoked meat fans debated whether Schwartz's or Bens had the best smoked meat sandwich. Bens thin sliced meat was piled high between rye bread, while Schwartz's offers plates of thickly cut smoked meat.

The famed Main Deli Steak House opened right across the street in 1974 and operated until 2023, becoming Schwartz's main business rival. The two restaurants were often compared against each other in their patronage and the flavours of their Montreal-style smoked meat. While both establishments continued to be rated highly in recent years, Schwartz's frequently won 'Best Montreal Sandwich Award' which Main never managed. Furthermore, Schwartz's was always much more popular among tourists who lined up there for hours while ignoring the Main Deli, attributed to Schwartz's "worldwide fame that makes it a must-enjoy attraction for tourists after 95 years in existence". Perhaps because of this, a frequent customer of Main Deli said "From what I heard, many Montrealers preferred it to Schwartz's. It felt like it had more of the real traditional feel, while Schwartz's can feel kind of touristy."

When the controversial Charter of the French Language (Bill 101) became law in 1977, Schwartz's sign outside was forcibly changed from "Hebrew delicatessen" to "Charcuterie Hébraïque de Montréal". The Office québécois de la langue française (OQLF) took action against Schwartz's and other stores retailing imported kosher goods that did not meet its labelling requirements, an action perceived in the Jewish community as an unfair targeting and antisemitism. This coincided with a high-profile case brought by the OQLF against Schwartz's due to the apostrophe in the establishment's sign, which remains. Schwartz's, along with other well-known delicatessen establishments, also fought a ruling to change the name of "Smoked Meat" to "Boeuf Mariné" in order to conform to Quebec Language Law. They won the ruling by appeal by proving that if they didn't advertise "Smoked Meat" they would confuse and anger customers. A good example of this was Parti Québécois MNA Gérald Godin who himself ordered the sandwich by its English name. Under the new ruling, enacted in 1987, Smoked meat became a word in both Official languages of Canada.