Studies were made of the food habits of four populations of cottontail rabbits (Sylvilagus floridanus mearnsi), one each from Franklin, Highland, Wood, and Williams Counties, Ohio. Fecal pellet samples were used so that populations would not be altered. After reference slides of the epidermes of possible food plants were made,histological analyses were made of pellet samples and plant particles were identified. Data indicated that the rabbits'' food was mainly herbaceous. Woody plants were used in years when snow covered herbaceous foods. Blue grass (Poa pratensis) was the most utilized food plant at all seasons by all populations. Seasonally used monocots were: orchard grass (Dactylis glomerata), timothy (Phleum pratense), and nodding wild-rye (Elymus canadensis). Seasonally used dicots were: red clover (Trifolium pratense) and Korean lespedeza Lespedeza stipulacea).