Tennessee - Area of significance: Architecture
| Oak Grove Methodist Church |
| Oak Grove School |
| Oak Hall |
| Oakham |
| Oak Hill Farm |
| Oakland |
| Oakland Presbyterian Church |
| Oaklands |
| Oakley |
| Oak Ridge Historic District |
| Oakslea Place |
| Oak Top |
| Obion County Courthouse |
| O'Bryan, George, House |
| Ochs Building |
| Ocoee No. 3 Hydroelectric Project |
| Ocoee Street Historic District |
| O'Dell House |
| Oden, Dr. Hezekiah, House |
| Officer Farmstead |
| Ogilvie, William, House |
| Ogle, Bud, Farm |
| Oglesby School |
| Old College |
| Old Deery Inn |
| Old Fentress County Jail |
| Old Grainger County Jail |
| Old Gray Cemetery |
| Old Hickory Historic District |
| Old Hickory Methodist Church |
| Old Jail |
| Old Kingsport Presbyterian Church |
| Old Knoxville City Hall |
| Old Library Building |
| Old North Knoxville Historic District |
| Old Post House |
| Old Post Office |
| Old Post Office Building |
| Old Scott County Jail |
| Old Town |
| Oliver Springs Banking Company |
| Olivet United Methodist Church, Parsonage and School |
| Omicron Sigma Chapter House of Sigma Gamma Rho Sorority, Incorporated |
| Omohundro Water Filtration Complex District |
| One Hundred North Main Building |
| Original Church of God |
| Orpheum Theatre |
| Ossoli Circle Clubhouse |
| Ousley, Baite, House |
| Overbrook |
| Overton County Courthouse |
| Overton Park Court Apartments |
| Overton Park Historic District |
| Overton Parkway Historic District |
| Owen Chapel Church of Christ |
| Owen, Charles, House |
| Owen, Dr. Urban, House |
| Owen-Primm House |
| Ownby, John, Cabin |
| Paisley Hall |
| Palace Theater |
| Palmer, Gen. Joseph B., House |
| Palmer, W. E., House |
| Palmetto Farm |
| Paramount Theatre and Office Building |
| Pardue, James M., House |
| Paris Commercial Historic District |
| Park City Historic District |
| Park City Junior High School |
| Park-Elkins Historic District |
| Park, James, House |
| Parks Place |
| Parkview Hotel Apartments |
| Parlett House |
| Parthenon, The |
| Patterson, Alexander, House |
| Patton-Bejach House |
| Patton, Samuel A., Building |
| Peabody Elementary School |
| Peabody High School |
| Peabody Hotel |
| Perkins, A.E., House |
| Perkins, Nicholas Tate, House |
| Perry County Courthouse |
| Perry's Camp |
| Petersburg Historic District |
| Peters House |
| Phillips House |
| Phillips, Thomas W., Memorial |
| Picardy Place Historic District |
| Pickett Chapel Methodist Church |
| Pickett State Rustic Park Historic District |
| Pilcher, Dr. Cobb, House |
| Pillow-Bethel House |
| Pillow Place |
| Pinch-North Main Commercial District |
| Pine Hill |
| Piney Flats Historic District |
| Pioneer Hall |
| Pisgah United Methodist Church and Cemetery |
Data from United States Park Service and Wikidata
