| Grec | Traditionnel | Scientifique | Code Beta | BGN/PCGN | Nations unies/ELOT | Greeklish |
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| Grec ancien | Grec moderne |
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| α | a | a | A | a | a | a | | β | b | b | B | v | v | b, v | | γ | g | g | G | g, y | g | g, y | | δ | d | d | D | dh, d | d | d, dh | | ε | e | e | E | e | e | e | | ζ | z | z, dz | Z | z | z | z, s | | η | e | ē | H | i | i | h, i, n | | θ | th | th | Q | th | th | th | | ι | i | i | I | i | i | i | | κ | c | k | K | k | k | k, c | | λ | l | l | L | l | l | l | | μ | m | m | M | m | m | m | | ν | n | n | N | n | n | n, v | | ξ | x | x | C | x | x | ks, x | | ο | o | o | O | o | o | o | | π | p | p | P | p | p | p, n | | ρ | r, rh | r, rh | R | r | r | r, p | | σ ς | s | s | S | s | s | s | | τ | t | t | T | t | t | t | | υ | y | u | U | i | y | y, u, i | | φ | ph | ph | F | f | f | f, ph | | χ | ch | ch | X | kh | ch | ch, x, h | | ψ | ps | ps | Y | ps | ps | ps, y | | ω | o | ō | W | o | o | w, o | | Combinaisons de voyelles |
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| αι | ae, e | ai | AI | e | ai | ai, e | | αυ | au | au | AU | av | av, af | ay, au, af, av | | ει | i | ei | EI | i | ei | ei, i | | ευ | eu | eu | EU | ev | ev, ef | ey, eu, ef, ev | | ηυ | eu | ēu | HU | iv | iv, if | hy, hu, if, iv | | οι | oe, e | oi | OI | i | oi | oi, i | | ου | u | ou | OU | u | ou | ou, u, oy | | υι | ui | ui | UI | i | yi | yi, gi, i | | Combinaisons de consonnes |
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| γγ | ng | ng | GG | ng | ng | gg, gk, ng | | γξ | nx | nx | GC | nx | nx | gks, gx | | γκ | nc | nk | GK | g, ng | gk | gk | | γχ | nch | nch | GX | nkh | nch | nx, nch | | μπ | mp | mp | MP | b, mb | b, mp | mp, b, mb | | ντ | nt | nt | NT | d, nd | nt | nt, d, nd | | Pour le grec moderne, le système qui se rapproche le plus de la prononciation grecque est celui de « BGN/PCGN ». |
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