While creating list of real flags suitable as symbols for languages, I found two pairs of nearly identical flags: Nordic cross yellow, red (Norn and Old Norse) and Nordic cross green, yellow, blue (Low Saxon and Veps). I was aware of more "twin flags" (Monaco and Indonesia, Romania and Chad...), so I created this gallery to catch them. First I tried to show as many twins as possible, now I list only categories for striped flags. If some category contains only one flag, it should be removed from this list, unless it is Nordic Cross flag.

Terminology:

  • Twin = same shape, colors, order, different hues or proportions
  • Sibling = twin defaced with different emblem (Slovakia and Slovenia)
  • Cousin = switched colors within same shape or modified shape within same colors (e.g. rotation, fimbriation)

Flags are nested by colors in English alphabet order. Tricolor flags are nested by their first two basic colors. Basic colors are black, blue, green, red, white and yellow. But it is easy to find flag with desired color regardless of their order. Every tricolor category can contain six permutations of twins. Total number of possible twin flag sets with two or three stripes and six basic colors is 360. How many is used, I have no guess.

I recommend visit Flag Identifier by Ivan Sarajčić for creating "identikit" of flag searched (including twins). For Nordic crosses see also this list from FOTW.

Black and blue

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Black, blue, brown

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Black, blue, green

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Black, blue, orange

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Black, blue, red

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Black, blue, white

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Nordic cross:

Cousins:

Black, blue, yellow

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Black and green

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Black, green, orange

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Black, green, red

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Kenya and South Sudan are fimbriated cousins

Nordic cross:

Black, green, white

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Nordic cross:

Black, green, yellow

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Black and orange

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Black and red

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Black, red, black

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Black, red, white

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Black, red, yellow

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Middle red stripe (cousins):

Proposals for Germany (cousins):

Olitopia (alternate history) is cousin

Red, black, red

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Black and white

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White cross (cousins):

Black cross

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Black, orange, white

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Black, pink, white

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Black, white, black

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Black, white, yellow

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White, black, white

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Black and yellow

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Yellow cross:

Black cross:

Black, yellow, black

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Yellow, black, yellow

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Blue and green

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Nordic cross:

Blue, brown, green

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Blue, green, red

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Blue, green, white

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Green, white, blue:

Blue, white, green:

Cousins:

Blue, green, yellow

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Green, yellow, blue:

Blue, yellow, green:

Blue and pink

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Blue and red

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Red saltire:

Blue, red, blue

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Blue, red, white

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Blue, white, red, white, blue with device

Blue, white, blue with diagonal red stripe

Nordic cross blue, white, red:

Cousins:

Cousins:

Blue border, white cross:

Halved white, blue, red:

Halved blue, white, red:

Red-white stripes, blue canton with white stars (siblings):

Quartered cousins:

Less than cousins:

Blue, red, yellow

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Cousins:

Red, blue, red

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Blue and white

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White cross:

Siblings:

Nordic cross:

Cross from stars:

White saltire:

Siblings:

Blue cross:

Nordic cross:

Blue saltire:

Siblings:

Diagonal stripe:

Blue, brown, white

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Blue, orange, white

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Blue, white, blue

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Two fictious countries:

Blue, white, yellow

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Nordic cross white, yellow, blue:

Cousins:

Halved blue, white, yellow:

Diagonally divided:

White, blue, white

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Blue and yellow

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Yellow cross:

Siblings:

Yellow saltire:

Blue cross:

Blue saltire:

Blue, orange, yellow

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Blue, purple, yellow

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Blue, yellow, blue

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Nordic cross:

  Baarn (Netherlands) has both striped and crossed cousins

Yellow, blue, yellow

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Green and orange

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Green and red

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Cross:

Green, purple, red

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Green, red, green

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Green, red, white

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Nordic cross green, white, red:

Cousins:

White left, red over green:

Vertically halved red, white, green:

Green, red, yellow

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Red, green, red

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Green and white

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White Nordic cross:

Siblings (mostly saltires):

White device (siblings or cousins?)

Cousins:

Brown, green, white

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Green, orange, white

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Green, pink, white

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Green, purple, white

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Green, white, green

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Green, white, yellow

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Quartered per cross:

White, green, white

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Green and yellow

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Green cross:

Yellow cross:

Saltire:

Yellow harp:

Yellow crescent:

Green, orange, yellow

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Green, pink, yellow

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Green, yellow, green

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Yellow, green, yellow

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Grey and white

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Maroon and white

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Maroon, white, maroon

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Orange and white

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The third color of Hernandarias is maroon or purple?

Purple and white

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Purple and yellow

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Red and white

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Nine stripes:

White cross:

Nordic cross:

Greek cross:

Maltese cross:

Saltire:

Red cross:

Siblings

Nordic cross:

Red saltire:

Siblings:

Quartered:

Per saltire:

White star:

Cousins:

Orange, red, white

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Red, white, red

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Red, white, yellow

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Siblings:

Cousins:

White, red, white

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Red and yellow

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Centered cross:

Nordic cross:

Red cross:

Siblings:

Purple, red, white

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Purple, red, yellow

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Red, yellow, red

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Nordic cross:

Yellow, red, yellow

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Yellow sun on red background

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White and yellow

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Orange, white, yellow

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Purple, white, yellow

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Yellow, white, yellow

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More than three colors

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Black, green, red, white

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White, red, yellow, black

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Blue, red, white, yellow

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Horizontally striped

Quartered 5173:

Cousins:

Meaning of numbers see here

Red-white stripes, blue canton with yellow crescent and star (siblings)

Nordic cross

Bonaire, Maruri-Jatabe

Quartered flags

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Numbers of directions:

3 2 1
4 . 0
5 6 7

Blue, red, white, yellow

Flags containing flag of Ulster

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I am vexillographer myself. If you want to see my initial list-of-twins design, write a note to me. It was much different and even now it is not perfect. If you have proposlas for another change, write to me. Now you can see more my pages (list is at my Indonesian user page).