Ohio - Area of significance: Architecture
| Brooklyn Bank Building |
| Brooklyn Centre Historic District |
| Brooks, James, House |
| Broom-Braden Stone House |
| Broom Building |
| Brown, Charles, Gothic Cottage |
| Brownella Cottage and Grace Episcopal Church and Rectory |
| Brown-Gorman Farm |
| Brownhelm Historic District |
| Brown, Jim, House |
| Brown, Jim, Tavern |
| Brown, John Hartness, House |
| Brown, Samuel N., House |
| Brown, Samuel, P., House |
| Brown, Seth, House |
| Brown Township Building |
| Brown-Wing House |
| Brownwood |
| Brumback Library |
| Brunswick-Balke-Collender Building |
| Bruns-Wynkoop House |
| Bryan Downtown Historic District |
| Bryn Mawr |
| Buchwalter House-Applethorpe Farm |
| Buckeye State Building and Loan Company Building |
| Buckeye Station |
| Buckingham-Petty House |
| Buckland, Ralph P., House |
| Buckner, Dr. Philip, House And Barn |
| Bucyrus Commercial Historic District |
| Bucyrus Mausoleum |
| Budd Dairy Company |
| Buehl House |
| Building at 101 North Franklin Street |
| Building at 223 West High Street |
| Building at 240 Park Avenue West |
| Building at 252-254 Park Avenue West |
| Building at 309 Park Avenue West |
| Building at 3101 Euclid Avenue |
| Building at 415 Park Avenue West |
| Building at 500 East High Street |
| Building at 505 East High Street |
| Building at 620-622 Vine Street |
| Bulen, Granville M., House and Farm Complex |
| Bullerdick, Frederick E. and Catherine, House |
| Bull, Jonah, House |
| Bull, T.J. and Sarah, House |
| Bunker Hill House |
| Burch, William, House |
| Burckhardt, A. E., House |
| Burdick, Harold B., House |
| Burdsal, Samuel, House |
| Burgett House And Barn |
| Burnett, William, House |
| Burnham, Henry, House |
| Burrell, Jabez and Robbins, House and Cheese Factory |
| Burrell-King House |
| Burr, George, House |
| Burroughs, C. H., House |
| Burt's Theater |
| Burt, William, House |
| Bushnell-Foos Historic District |
| Bushnell, Martin, House |
| Bush, Samuel, House |
| Bush Street Historic District |
| Butler, Charles, House |
| Butler County Courthouse |
| Butler, Cyrus, House |
| Butler, H. Karl, Memorial |
| Butler Institute Of American Art |
| Butler, J.G., House |
| Buttles, Aurora, House |
| Buttles-Johnson House |
| Buxton Inn |
| Byers, John F., House |
| Cable, Frank, House |
| Cable, Laurence House |
| Cable Park Historic District |
| Cahill, Beck and R. C., Buildings |
| Cahill, Michael, House |
| Cahoon, Samuel C., House |
| Caldwell Downtown Historic District |
| Caledonia Public Square and North Water Street Historic District |
| Calvary Episcopal Church Sunday School |
| Calvary Presbyterian Church |
| Cambridge Arms |
| Camden City Hall and Opera House |
| Camden Public School |
| Campbell, Hugh, House |
| Campbell School |
| Camp Manatoc Concord Lodge and Adirondacks Historic District |
| Camp Manatoc Dining Hall |
| Camp Manatoc Foresters Lodge and Kit Carson-Dan Boone Cabins Historic District |
| Camp Manatoc Legion Lodge |
| Canal Fulton Historic District |
| Canal Winchester Methodist Church |
| Canton Public Library |
| Capital University Historic District |
| Capt. Stone House |
| Carew Tower |
Data from United States Park Service and Wikidata
