Mimulus tilingii is a species of monkeyflower known by the common name Tiling's monkeyflower. It is native to much of western North America, from Alaska to California to New Mexico, where it grows in moist and wet habitat, such as streambanks and mountain meadows. This plant is often nearly impossible to distinguish from its common relative, Mimulus guttatus, as their characteristics can intergrade. This is a rhizomatous perennial herb growing 2 to 35 centimeters tall. The oppositely arranged oval leaves may be several centimeters long and some are borne on short petioles. The yellow flower may be over 4 centimeters long, its narrow tubular throat opening into a wide, two-lipped mouth. The base of the flower tube is encapsulated in a calyx of sepals with uneven lobes.