Montia linearis is a species of flowering plant in the purslane family known by the common names narrowleaf miner's lettuce and narrow-leafed montia. It is native to western North America from British Columbia to California to Utah, where it grows in moist to wet areas in a number of habitat types, including forests and meadows, woodlands, and grassland. The plant is also known from some areas of the southeastern United States, including Mississippi.