| Oaken Pin |
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| Oat |
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| Obelisk |
| A synonym for Flamenco. |
| Oberly |
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| Obilnoye |
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| Ode |
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| Odin |
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| Oekonomierat Echter-Meyer |
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| Oetwiler Reinette |
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| Ogden |
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| Ohio Nonparell |
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| Ohio Pippin |
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| Ohio Sweet |
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| Ohlson |
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| Okabena |
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| Okanagan |
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| Okanagan Jesuit Mission |
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| Old Cider |
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| Oldenburg |
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| Old English Millim |
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| Old Esquimali Road |
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| Old Grandad |
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| Old Homestead |
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| Old Horse (Wise, VA) |
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| Old Liberty |
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| Old Log Cabin |
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| Old Man |
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| Old Nonesuch |
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| Old Pearmain |
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| Old Timey Winesap |
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| Old Tyme Pippin |
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| Old Virginia Spice |
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| Oley Olson |
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| Olinger Raspberry |
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| Olinger Red |
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| Oliver |
| Fruit size is medium to large with thick, smooth, glossy yellow skin overlaid with rich-red and streaks of darker red. The surface is punctuated with large, conspicuous, light colored dots. The yellowish flesh is fine-grained and juicy and often stained with red. Ripens October to November and is an excellent keeper. |
| Oljanisceva |
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| Olympia |
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| Ontario |
| Very good eating, juice and cooking apple. Medium-large fruit with green skin flushed and striped red. Flesh fine textured, very juicy, sprightly and aromatic. |
| Ontario Russet |
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| Ooten |
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| Opal |
| A modern apple from the Czech Republic, related to Golden Delicious and Topaz. |
| Opalescent |
| A popular New England apple. Large fruit with smooth skin entirely covered with dark red, occasionally shading to purplish with splashes of carmine. Firm, juicy, mildly subacid, yellow flesh with a hint of strawberries. Ripens in September |
| Opal Seabrook |
| An early-season English apple, with very similar qualities to one of its parents, Worcester Pearmain. |
| Ophir |
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| Oporto |
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| Orange |
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| Orangeapfel |
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| Orange Sweet |
| Small, somewhat conical fruit, medium in size. Pale yellow apple often somewhat blushed, nearly orange yellow when ripe. Flesh tinged with yellow, moderately fine grained, tender, moderately sweet. Skin tough.
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| Oregon City |
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| Oregon Spur Delicious |
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| Orei |
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| Orenco |
| Medium to large fruit with bright red skin. Tender, crisp, juicy white flesh. Very sweet and piquant flavor. Light bearer. Must be picked as soon as it is ripe. Scab resistant. Origin: Oregon 1920 |
| Oriatia Beauty |
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| Orient Beauty |
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| Orin |
| Yellow skin is blushed red-orange and dotted with conspicuous white lenticels. Sweet, very honeyed, pale yellow flesh, but of little taste or acidity of fruit. Shares same parentage as Mutsu. |
| Orin Jumbo |
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| Oriole |
| An early-season American apple from the University of Minnesota. Yellow, striped red, An excellent quality dessert or cooking apple. Tree extrememly productive. Yellow Transparent X Liveland Raspberry |
| Orkney |
| An attractive old apple, probably from Scotl |
| Orleans |
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| Orleans Reinette |
| France 1700s. Round, flattened, greenish-yellow fruit with some cinnamon russet in most cases. Flesh is creamy white, firm and fine-textured and very juicy with a taste first of sweet oranges followed by a nutty flavor. Trees are vigorous, heavily spurred. Ripens in October |
| Ortley |
| (Big Horse Creek Farm) New Jersey 1800s. The fruit resembles the better known Yellow Bellflower, but is less acid in flavor. Fruit is medium to large, conical, with greasy yellow skin occasionally having a fine red blush. The creamy white flesh is tender and juicy. Ripens October to January. |
| Osbo |
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| Osheas Red Discovery |
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| Oslin |
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| Osman (Crab) |
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| Oswego |
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| Ottawa |
| Very good early eating, cooking and sauce apple. Greenish-yellow washed and striped with red. Juicy and spicy. |
| Otterson |
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| Ottowa 546 |
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| Oval Crab |
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| Owen Cobb |
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| Owen Mullens Early Red June |
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| Owen Mullins |
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| Owen Mullins Red |
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| Owl Medow |
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| Oxbo |
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| Oxheart Pippin |
| Choice eating; deep flavor with a lot of juice; excellent keeper |
| Ozark Gold |
| Developed at the Missouri State Agricultural Experimental Station and introduced in 1970. It is similar in flavor and appearance to Golden Delicious but ripens about three weeks earlier. It bears young and shows some disease resistance but is a biennial bearer. It is a large to very large apple with bright yellow waxy skin. A1291x Golden Delicious |
| Ozark Pippin |
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