Merlot is a red wine grape that is used as both a blending grape and for varietal wines. Merlot-based wines usually have medium body with hints of berry, plum, and currant. Its softness and "fleshiness", combined with its earlier ripening, makes Merlot an ideal grape to blend with the sterner, later-ripening Cabernet Sauvignon. This flexibility has helped to make it one of the most popular red wine varietals in the United States.

Merlot is produced primarily in France (where it is the third most planted red grape), Italy (where it is the country's 5th most planted grape) and California. In areas that are too warm, Merlot will ripen too early.

In the traditional Bordeaux blend, Merlot's role is to add body and softness. Despite accounting for 50-60% of overall plantings in Bordeaux, the grape tends to account for an average of 25% of the blends-especially in the Graves and Médoc. However, in the regions of Pomerol and Saint-Emilion it is not unusual for Merlot to comprise the majority of the blend. One of the most famous and rare wines in the world, Château Pétrus, is almost all Merlot.