This list includes 31 Colors that start with O, from “OU Crimson” to “Oyster”. Many of these shades range from earthy ochres and olive tones to bright oranges and soft neutrals. They suit branding, web and product design, illustration, and DIY projects.

Colors that start with O are color names beginning with the letter O and often reference natural or cultural sources. For example, ochre pigments appear in prehistoric art and show how these names can carry long cultural histories.

Below you’ll find the table with Name, Hex, RGB and Color psychology.

Name: The color’s common name as used in design and catalogs, so you can search or reference it quickly.

Hex: The six‑digit hexadecimal code you can copy for web or digital projects to apply exact colors.

RGB: Red, green, blue values for color-matching across screens and tools when you need precise digital reproduction.

Color psychology: A short summary of typical emotional or cultural associations to help you pick tones for user response and mood.

Colors that start with O

NameHexRGBSource / Family
Obsidian#0804028, 4, 2Common name (from volcanic glass)
Ocean Boat Blue#0077BE0, 119, 190Crayola
Ocean Green#48BF9172, 191, 145Wikipedia
Ochre#CC7722204, 119, 34Wikipedia (from pigment)
Old Brick#900C3F144, 12, 63Common paint name, Wikipedia
Old Burgundy#43302E67, 48, 46Common paint name, Wikipedia
Old Copper#725B4B114, 91, 75Common paint name, Wikipedia
Old Gold#CFB53B207, 181, 59Crayola, common name
Old Lace#FDF5E6253, 245, 230CSS named color, W3C standard
Old Lavender#796878121, 104, 120Common paint name, Wikipedia
Old Mauve#673147103, 49, 71Wikipedia (historical color)
Old Rose#C08081192, 128, 129Wikipedia (from 1930 color dictionary)
Olive#808000128, 128, 0CSS named color, X11
Olive Drab#6B8E23107, 142, 35CSS named color, W3C standard
Olive Green#BAB86C186, 184, 108Crayola
Onyx#35383953, 56, 57Wikipedia, common name
Opal#AEC6CF174, 198, 207Wikipedia (gemstone)
Opera Mauve#B784A7183, 132, 167Wikipedia (historical color)
Orange#FFA500255, 165, 0CSS named color, W3C standard
Orange Peel#FF9F00255, 159, 0Common name
Orange-Red#FF4500255, 69, 0CSS named color, W3C standard
Orange-Yellow#F8D568248, 213, 104Crayola
Orchid#DA70D6218, 112, 214CSS named color, W3C standard
Orioles Orange#FB4F14251, 79, 20Crayola, MLB team color
Orpiment#FCD21C252, 210, 28Mineral name, Wikipedia
Otter Brown#654321101, 67, 33Wikipedia, common name
OU Crimson#841617132, 22, 23University of Oklahoma official color
Outer Space#414A4C65, 74, 76Crayola
Outrageous Orange#FF6E4A255, 110, 74Crayola
Oxford Blue#0021470, 33, 71Official color of Oxford University
Oyster#EAE6CA234, 230, 202Common paint name, Resene

Descriptions

Obsidian
An extremely dark, near-black color. Evokes strength, mystery, and a sleek, modern aesthetic for minimalist or high-tech branding.
Ocean Boat Blue
A strong, classic cerulean blue, reminiscent of the deep sea. It feels trustworthy, calm, and dependable, perfect for corporate or nautical themes.
Ocean Green
A refreshing, medium-light green with blue undertones. Evokes tropical waters, tranquility, and clarity, ideal for wellness or travel brands.
Ochre
An earthy, deep yellow-orange-brown pigment. Its ancient origins give it a warm, natural, and timeless feel in design.
Old Brick
A deep, muted crimson red with a touch of brown. It conveys a sense of history, stability, and rustic, traditional charm.
Old Burgundy
A very dark, desaturated reddish-brown, like aged wine. This color evokes a sense of age, luxury, and warmth in sophisticated designs.
Old Copper
A warm, aged brownish color with muted red undertones. Suggests industrial heritage, rustic warmth, and steadfast reliability.
Old Gold
A dark, muted yellow with an antique metallic feel. It suggests wealth, tradition, and timeless elegance without being overly bright.
Old Lace
An extremely pale, warm off-white with a hint of yellow. Its soft, antique feel creates a sense of elegance, comfort, and quiet nostalgia.
Old Lavender
A dusty, grayish-purple that feels serene and contemplative. This muted shade creates a nostalgic, sophisticated, and calming atmosphere.
Old Mauve
A grayish, muted purple with a distinct vintage feel. It offers a sense of history, quiet sophistication, and romantic depth.
Old Rose
A dusty, muted shade of pink. Gives a vintage, romantic, and charming impression, softer and more mature than brighter pinks.
Olive
A dark, muted yellowish-green, reminiscent of green olives. Often associated with peace, nature, and military themes, lending a sophisticated or rustic feel.
Olive Drab
A duller, deeper green than standard olive. Widely used for camouflage and utilitarian designs, it conveys ruggedness and practicality.
Olive Green
A lighter, more yellowish take on olive. This friendly, organic green feels peaceful, natural, and approachable, great for eco-conscious branding.
Onyx
A deep, rich off-black with a hint of cool gray. A sophisticated and modern alternative to pure black, it feels grounded and strong.
Opal
A pale, cloudy blue-gray with an iridescent quality. Creates a dreamy, soft, and ethereal mood, perfect for elegant and subtle designs.
Opera Mauve
A mid-tone purple-pink that was once highly fashionable. It now carries a historic, slightly dramatic, and uniquely romantic feel.
Orange
A vibrant, energetic secondary color between red and yellow. Evokes enthusiasm and creativity, perfect for calls-to-action and youthful branding.
Orange Peel
A pure, bright orange like the fruit’s rind. Zesty, fun, and attention-grabbing, this color radiates positivity and excitement.
Orange-Red
A vivid reddish-orange that balances the energy of both colors. This high-impact color is bold and demanding, perfect for grabbing attention.
Orange-Yellow
A sunny, warm color balanced between orange and yellow. It radiates happiness, warmth, and optimism, making it cheerful and inviting.
Orchid
A bright, light purple with pink undertones, named after the flower. It suggests exoticism, femininity, and a touch of modern luxury.
Orioles Orange
The bold, fiery orange of the Baltimore Orioles baseball team. A high-visibility color perfect for conveying team spirit and dynamic energy.
Orpiment
A vibrant, golden-yellow named after the arsenic sulfide mineral. It’s a brilliant and eye-catching color associated with art and alchemy.
Otter Brown
A rich, medium-dark brown, like the fur of an otter. A classic, earthy neutral that feels warm, grounded, and reliable.
OU Crimson
A deep, powerful crimson associated with the university. This strong color conveys tradition, passion, and institutional pride.
Outer Space
A dark charcoal gray, like the void of space. A modern, neutral color that works well for sleek, technological, or futuristic designs.
Outrageous Orange
A bright, fluorescent-like orange with a touch of red. This color is fun, loud, and full of youthful energy, designed to be playful and unmissable.
Oxford Blue
A very dark, formal shade of navy blue. It conveys tradition, authority, intelligence, and a deep sense of heritage.
Oyster
A very light, warm grayish-beige with a hint of green. A subtle, sophisticated neutral that provides a calm, elegant, and organic backdrop.
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