Mayonnaise (, or in AmE also , and often abbreviated as mayo ) is a thick, creamy sauce often used as a condiment. It is a stable emulsion of oil, egg yolk, and either vinegar or lemon juice, with many options for embellishment with other herbs and spices. Proteins and lecithin in the egg yolk serve as emulsifiers in both mayonnaise and hollandaise sauce. Commercial egg-free alternatives are available for vegans and others who want to avoid animal products and cholesterol, or who are allergic to eggs.

Mayonnaise is a 5-piece Filipino alternative rock band. The band is fronted by Monty Macalino who due to his unarguably hefty body figure, makes him the most visible member of the group. The band is famous for winning the prestigious Red Horse Muziklaban in 2004.