This topic is about the footpath located in Massachusetts and New Hampshire. It should not be confused with the similarly named Metacomet Trail of Connecticut.

The Metacomet-Monadnock Trail (M&M Trail) is a  hiking trail that traverses the Metacomet Ridge of the Pioneer Valley region of Massachusetts and the central uplands of Massachusetts and southern New Hampshire. Although less than from Boston and other large population centers, the trail is considered remarkably rural and scenic and includes many areas of unique ecologic, historic, and geologic interest. Notable features include waterfalls, dramatic cliff faces, exposed mountain summits, woodlands, swamps, lakes, river floodplain, farmland, significant historic sites, and the summits of Mount Monadnock, Mount Tom and Mount Holyoke. The Metacomet-Monadnock Trail is maintained largely through the efforts of the Berkshire Chapter of the Appalachian Mountain Club (AMC). Much of the trail (but not all) is a portion of the New England National Scenic Trail.