Club soda is a soft drink closely related to soda water, except that it contains a small amount of salt for flavor. Sometimes, however, club soda is used as a synonym for soda water; see that article for details.

The composition of club soda varies among different brands. The most common additions are sodium citrate and sodium chloride; other possible ingredients are sodium bicarbonate, potassium sulfate, and disodium phosphate . The total amount of sodium is usually comparable to other flavored soft drinks.

Club soda containing sodium citrate has a slightly sour flavor (similar to citrus fruits), noticeable when consumed by itself and in certain mixed drinks, but usually not strong enough to be detected when mixed with stronger flavored beverages, such as juice. It is often used as a substitute for plain soda water, commonly as a mixer.

Common mixed drinks which may include club soda:

• Scotch and soda
• Whiskey sour

Popular brands of club soda:

• Canada Dry
• Schweppes