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- Ohio Female College
- Ohio Female Medical Education Society
- Ohio Folklore Society
- Ohio Gang
- Ohio General Assembly
- Ohio Governor's Office
- Ohio Hispanic Coalition
- Ohio Historical Society
- Ohio History Connection
- Ohio Hospital for Epileptics
- Ohio House Bill 610 (Gender Discrimination Prohibition)
- Ohio Income Tax
- Ohio Indian Wars
- Ohio Industrial Commission
- Ohio Institution for the Deaf and Dumb
- Ohio Institution for the Education of the Blind
- Ohio Legislature
- Ohio Life Insurance and Trust Company
- Ohio Loan Law of 1837
- Ohio Lottery
- Ohio Lunatic Asylum
- Ohio Mechanics Institute
- Ohio Medical Association
- Ohio Military Reserve
- Ohio Militia
- Ohio Miners Amalgamated Association
- Ohio National Guard
- Ohio Naval Militia
- Ohio Northern University
- Ohio Oil Company
- Ohio Orbits
- Ohio Orphan's Friend
- Ohio Penitentiary
- Ohio Penitentiary Fire
- Ohio Penitentiary Riot (1952)
- Ohio Penitentiary Riot (1968)
- Ohio Progressive Republican League
- Ohio Public Accommodations Law of 1884
- Ohio Reform School
- Ohio Relief Commission
- Ohio Retail Sales Tax Law of 1935
- Ohio River
- Ohio River Flood of 1937
- Ohio River Valley Water Sanitation Commission
- Ohio School Law
- Ohio School of the Air
- Ohio Shale
- Ohio Soldier's and Sailors' Orphans' Home
- Ohio Soldiers' and Sailors' Home
- Ohio Soldiers' and Sailors' Orphans' Home
- Ohio Stadium
- Ohio State Archaeological and Historical Society
- Ohio State Board of Agriculture
- Ohio State Board of Health
- Ohio State Fair
- Ohio State Highway Patrol
- Ohio State Journal
- Ohio State Medical Association
- Ohio State School for the Blind
- Ohio State School for the Deaf
- Ohio State Slogan
- Ohio State Teachers' Association
- Ohio State Tree
- Ohio Statehood
- Ohio Statehouse
- Ohio Statesman
- Ohio Supreme Court
- Ohio Swarm
- Ohio Tobacco Festival
- Ohio Tobacco Museum
- Ohio Turnpike Commission
- Ohio Un-American Activities Committee
- Ohio Unemployment Compensation Law
- Ohio Unemployment Insurance Commission
- Ohio University
- Ohio University Data Theft Case
- Ohio University Die-in
- Ohio Valley Company
- Ohio Veterans' Children's Home
- Ohio Veterans Home
- Ohio Veterans Home Cemetery
- Ohio Volunteer Infantry
- Ohio Waisenfreund
- Ohio Wesleyan University
- Ohio Woman Suffrage Association
- Ohio Women's Rights Association
- Ohio Women's Temperance Society
- Ohio Xoggz
- Ohio and Erie Canal
- Ohio and Mississippi Railroad
- Ohioana Library
- Oil Industry
- Oil and Gas
- Ojibwa Indians
- Old Colony Burying Ground
- Old Maid's Kitchen
- Old Man's Cave
- Old Tavern
- Olde Wayside Inn
- Oldfield, Barney
- Olentangy Shale
- Oliver H. Perry
- Oliver Phelps
- Olympia Brown
- Omnivore
- On Leong Tong
- Oolitic
- Oorang Indians
- Opaque
- Operation Enduring Freedom
- Opper, Frederick B.
- Order of American Knights
- Ordinance of 1784
- Ordovician Period
- Ore
- Organic
- Ormsby M. Mitchel
- Orr v. Allen
- Orville Wright
- Osborn, Charles
- Osborn, Ralph
- Osborn v. Bank of the United States
- Other Field Crops
- Othniel Looker
- Otis, George K.
- Otis Steel Company
- Ottawa, Ohio
- Ottawa County
- Ottawa Indians
- Otterbein College
- Outwash
- Over-the-Rhine, Ohio
- Over the Hill in October
- Owens, Jesse
- Owens, Michael J.
- Owens-Illinois, Inc.
- Owens Bottle Machine Company
- Owens Community College
- Owens Technical College
- Ownership of the Ohio River
- Ox Cart Library
- Oxford Female Institute
- Ozem Gardner
- PVC
- Pacifists
- Packard Electric Company
- Packard Motor Car Company
- Paddlefish
- Paige, Leroy
- Painesville, Ohio
- Paleoindian Period
- Paleozoic Era
- Pampers
- Panic of 1819
- Panic of 1837
- Panic of 1857
- Panic of 1893
- Paper Bags
- Parachute
- Parachute with Ripcord
- Paragon Tomato
- Paramount's Kings Island
- Parker, Hortense
- Parker, John P.
- Parmalee, Phillip
- Parsons, Samuel H.
- Passenger Pigeon
- Patrons of Husbandry
- Patterson, Isaac
- Patterson, John H.
- Patterson, Robert
- Pattison, John M.
- Paul Brown
- Paul L. Dunbar
- Paul R. Mort
- Paul W. Tibbets Jr.
- Paulding, Ohio
- Paulding County
- Paw Paw
- Payne Theological Seminary
- Paynes Crossing, Ohio
- Peace Democrats
- Peale, Norman V.
- Pearl Harbor
- Pease, Calvin
- Pease, Seth
- Peccary Fossils
- Pectoral
- Pee Pee Settlement
- Peerless Motor Vehicle Company
- Peltier, Leslie C.
- Pendleton, George
- Pendleton Act
- Penick v. Columbus Board of Education
- Pennsylvania and Ohio Canal
- Pennsylvanian Period
- People's Party
- Peregrine Falcon
- Perkins, Simon
- Permian Period
- Perry's Victory and International Peace Memorial
- Perry, Oliver H.
- Perry County
- Perry L. Green
- Peter E. Rose
- Peter Fossett
- Peter N. Van Schaik
- Peter T. George
- Petroglyphs
- Petroleum Oil and Natural Gas
- Phantoscope
- Phelps, Oliver
- Phil Donahue
- Philander Chase
- Philip Grandin
- Philip H. Sheridan
- Philip K. Clover
- Philipps Cemetery
- Phillip Parmalee
- Phillips, Caroline F. "Carrie"
- Phillips, Thomas
- Phoebe A. Moses
- Phoebe A. Mozee
- Phoebe Cary
- Phyllis Driver
- Phyllocarid Fossils
- Piankashaw Indians
- Pickaway County
- Pickaway Plains
- Pickawillany
- Pickerington Violet Festival
- Pickrell, Henry
- Pike County
- Piketon Mounds
- Pileated Woodpecker
- Pilgrim
- Pine Street Colored Cemetery
- Pitted Stone and Hammer
- Placoderm Fossils
- Plain City, Ohio
- Plankton
- Plano Culture
- Plant Fossils
- Plastron
- Platt Benedict
- Platt R. Spencer
- Play-Doh
- Playfair, William
- Pleasant Valley (Madison County), Ohio
- Pleistocene Epoch
- Pliocene Epoch
- Plunder Law
- Plunkett, Roy J.
- Poindexter (Last Name Unknown)
- Poke Patch Settlement
- Pokrok
- Poliomyelitis
- Polish Ohioans
- Polk, James
- Pollard, Frederick D.
- Pollard, Fritz
- Pollinate
- Pollock Works
- Polymer Valley
- Polyvinyl Chloride
- Pomeroy, Alanson
- Pomeroy, Ohio
- Pond Law
- Ponderosa
- Pontiac
- Pontiac's Rebellion
- Pontifical College Josephinum
- Poorhouse
- Popular Sovereignty
- Populist Party
- Port Clinton, Ohio
- Portage County
- Portage Path
- Portsmouth, Ohio
- Portsmouth Brewery
- Portsmouth Cement & Lime
- Portsmouth Cement Lime
- Portsmouth Earthworks
- Portsmouth Foundry and Machine Works
- Portsmouth Guards
- Portsmouth Spartans
- Potawatomi Indians
- Potter Stewart
- Poultry
- Powderly, Terence
- Powel Crosley Jr.
- Powell, Dawn
- Powell, William
- Powell Sr., Adam C.
- Praying Mantis
- Pre-Clovis Culture
- Pre-Illinoian Glacier
- Preble County
- Precambrian
- Predator
- Presbyterian Church
- Presidential Election of 1876
- Presidential Election of 1912
- Presidential Election of 1916
- Preston, Roberta
- Prey
- Price, John
- Pride of Ohio Tabernacle, No. 384
- Pro Football Hall of Fame
- Proclamation of 1763
- Procter, Henry
- Procter, William C.
- Procter & Gamble
- Procter Gamble
- Progressive Movement
- Progressive Party
- Progressives
- Prohibition
- Prohibition Party
- Property Tax
- Protestantism
- Public Education
- Public Schools
- Public Works Administration
- Pugh, Achilles
- Pumpkinseed Sunfish
- Pupal
- Purcell, John
- Putnam, Frederic W.
- Putnam, Israel
- Putnam, Rufus
- Putnam County
- Putnam Greys
- Pyke, Bernice S.
- Pyrite (Iron Sulfide)
- Quaker Oats Company
- Quakers
- Quantrill, William C.
- Quartz (Silicon Dioxide)
- Quaternary Period
- Quebec Act
- Question Mark Butterfly
- Quinby, Ephraim
- Quincy Gillmore
- Quinn Chapel African Methodist Episcopal Church (Chillicothe, Ohio)