The X Window System (aka X11 or X) is a common GUI interface for Unix and OpenVMS. Here is a table of the 140 X11 color name in alphabetical order by name and hexadecimal values. Two pairs of color names actually refer to the same value (Cyan and aqua both refer to 00-FF-FF; Magenta and fuchsia both refer to FF-00-FF) so there are actually 138 distinct color values.

The table include some Web safe colors as well as some VGA colors.

The X11 color list is usually stored as <X11root>/lib/rgb.txt. Some times the list lists each color twice: using no spaces case (as in the case below) and with spaces in multi-word colors. Check your system for case because some use all lower case and some use UpperCamel or lowerCamel (this is important since Unix is case sensitive). X11 is so well known in the tech world that most browsers will recognize the name in HTML tags --in fact this table specifies color by name instead of by RGB (EG: style="background: cornflowerblue" instead of style="background: #6495ED") and it works perfectly in browsers such as Mozilla Firefox, Microsoft Internet Explorer, Apple Safar, Opera, and Google Chrome.

AliceBlue
(#F0F8FF)
AntiqueWhite
(#FAEBD7)
aqua
(#00FFFF)
Aquamarine
(#7FFFD4)
azure
(#F0FFFF)
beige
(#F5F5DC)
bisque
(#FFE4C4)
black
(#000000)
BlanchedAlmond
(#FFEBCD)
blue
(#0000FF)
BlueViolet
(#8A2BE2)
brown
(#A52A2A)
BurlyWood
(#DEB887)
CadetBlue
(#5F9EA0)
chartreuse
(#7FFF00)
chocolate
(#D2691E)
coral
(#FF7F50)
CornflowerBlue
(#6495ED)
cornsilk
(#FFF8DC)
crimson
(#DC143C)
cyan
(#00FFFF)
DarkBlue
(#00008B)
DarkCyan
(#008B8B)
DarkGoldenrod
(#B8860B)
DarkGray
(#A9A9A9)
DarkGreen
(#006400)
DarkKhaki
(#BDB76B)
DarkMagenta
(#8B008B)
DarkOliveGreen
(#556B2F)
DarkOrange
(#FF8C00)
DarkOrchid
(#9932CC)
DarkRed
(#8B0000)
DarkSalmon
(#E9967A)
DarkSeaGreen
(#8FBC8B)
DarkSlateBlue
(#483D8B)
DarkSlateGray
(#2F4F4F)
DarkTurquoise
(#00CED1)
DarkViolet
(#9400D3)
DeepPink
(#FF1493)
DeepSkyBlue
(#00BFFF)
DimGray
(#696969)
DodgerBlue
(#1E90FF)
FireBrick
(#B22222)
FloralWhite
(#FFFAF0)
ForestGreen
(#228B22)
fuchsia
(#FF00FF)
gainsboro
(#DCDCDC)
GhostWhite
(#F8F8FF)
gold
(#FFD700)
goldenrod
(#DAA520)
gray
(#808080)
green
(#008000)
GreenYellow
(#ADFF2F)
honeydew
(#F0FFF0)
HotPink
(#FF69B4)
IndianRed
(#CD5C5C)
indigo
(#4B0082)
ivory
(#FFFFF0)
khaki
(#F0E68C)
lavender
(#E6E6FA)
LavenderBlush
(#FFF0F5)
LawnGreen
(#7CFC00)
LemonChiffon
(#FFFACD)
LightBlue
(#ADD8E6)
LightCoral
(#F08080)
LightCyan
(#E0FFFF)
LightGoldenrodYellow
(#FAFAD2)
LightGreen
(#90EE90)
LightGrey
(#D3D3D3)
LightPink
(#FFB6C1)
LightSalmon
(#FFA07A)
LightSeaGreen
(#20B2AA)
LightSkyBlue
(#87CEFA)
LightSlateGray
(#778899)
LightSteelBlue
(#B0C4DE)
LightYellow
(#FFFFE0)
lime
(#00FF00)
LimeGreen
(#32CD32)
linen
(#FAF0E6)
magenta
(#FF00FF)
maroon
(#800000)
MediumAquamarine
(#66CDAA)
MediumBlue
(#0000CD)
MediumOrchid
(#BA55D3)
MediumPurple
(#9370DB)
MediumSeaGreen
(#3CB371)
MediumSlateBlue
(#7B68EE)
MediumSpringGreen
(#00FA9A)
MediumTurquoise
(#48D1CC)
MediumVioletRed
(#C71585)
MidnightBlue
(#191970)
MintCream
(#F5FFFA)
MistyRose
(#FFE4E1)
moccasin
(#FFE4B5)
NavajoWhite
(#FFDEAD)
navy
(#000080)
OldLace
(#FDF5E6)
olive
(#808000)
OliveDrab
(#6B8E23)
orange
(#FFA500)
OrangeRed
(#FF4500)
orchid
(#DA70D6)
PaleGoldenrod
(#EEE8AA)
PaleGreen
(#98FB98)
PaleTurquoise
(#AFEEEE)
PaleVioletRed
(#DB7093)
PapayaWhip
(#FFEFD5)
PeachPuff
(#FFDAB9)
peru
(#CD853F)
pink
(#FFC0CB)
plum
(#DDA0DD)
PowderBlue
(#B0E0E6)
purple
(#800080)
red
(#FF0000)
RosyBrown
(#BC8F8F)
RoyalBlue
(#4169E1)
SaddleBrown
(#8B4513)
salmon
(#FA8072)
SandyBrown
(#F4A460)
SeaGreen
(#2E8B57)
seashell
(#FFF5EE)
sienna
(#A0522D)
silver
(#C0C0C0)
SkyBlue
(#87CEEB)
SlateBlue
(#6A5ACD)
SlateGray
(#708090)
snow
(#FFFAFA)
SpringGreen
(#00FF7F)
SteelBlue
(#4682B4)
tan
(#D2B48C)
teal
(#008080)
thistle
(#D8BFD8)
tomato
(#FF6347)
turquoise
(#40E0D0)
violet
(#EE82EE)
wheat
(#F5DEB3)
white
(#FFFFFF)
WhiteSmoke
(#F5F5F5)
yellow
(#FFFF00)
YellowGreen
(#9ACD32)

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