Allyl methyl sulfide is an organosulfur compound with the chemical formula CH2=CHCH2SCH3.

The molecule features two functional groups, an allyl (CH2=CHCH2) and a sulfide.

It is a colourless liquid with a strong odor characteristic of alkyl sulfides.

It is a metabolite of garlic, and "garlic breath" is attributed to its presence.

[1] It is prepared by the reaction of allyl chloride with sodium hydroxide and methanethiol.