NATO Phonetic Alphabet vs. the Greek Alphabet

If you've heard "Alpha, Bravo, Charlie..." on a movie radio or in an airline cockpit, you've encountered the NATO phonetic alphabet — also called the ICAO spelling alphabet or "military alphabet." It starts with "Alpha," which is also the first Greek letter, so the two are often confused. They're not the same thing. Here's the difference and the full list of both.

The Short Answer

The Greek alphabet is a 24-letter writing system, in continuous use since the 8th century BCE, used to write the Greek language and as scientific notation. The NATO phonetic alphabet is a 26-word code system, adopted in 1956, used to spell out Latin letters unambiguously over noisy radio. The only overlap is that NATO uses "Alpha" for A — taking the name of the first Greek letter — but the rest of the NATO words have nothing to do with Greek.

The Full NATO Phonetic Alphabet

Each word represents one Latin letter. Numbers have their own pronunciations too ("niner" for 9 to avoid confusion with "fiver"). The alphabet was designed to maximize intelligibility across English, French, and Spanish accents.

Letter	NATO word	Pronunciation
A	Alpha	AL-fah
B	Bravo	BRAH-voh
C	Charlie	CHAR-lee
D	Delta	DEL-tah
E	Echo	EK-oh
F	Foxtrot	FOKS-trot
G	Golf	GOLF
H	Hotel	hoh-TELL
I	India	IN-dee-ah
J	Juliett	JEW-lee-ett
K	Kilo	KEY-loh
L	Lima	LEE-mah
M	Mike	MIKE
N	November	no-VEM-ber
O	Oscar	OSS-ker
P	Papa	PAH-pah
Q	Quebec	keh-BECK
R	Romeo	ROW-me-oh
S	Sierra	see-AIR-rah
T	Tango	TAN-go
U	Uniform	YOU-nee-form
V	Victor	VIK-ter
W	Whiskey	WISS-key
X	X-ray	EKS-ray
Y	Yankee	YANG-key
Z	Zulu	ZOO-loo

The Three NATO Words That Could Have Been Greek

Only three NATO code-words happen to share names with Greek letters:

Alpha (A) — same as Greek alpha (Α α).
Delta (D) — same as Greek delta (Δ δ).
Sierra (S) — this is Spanish for "mountain range," not the Greek sigma. Sigma is used elsewhere in military communications (e.g., the NATO "Sigma" call sign for a specific mission), but the standard letter S is "Sierra."

The rest of the NATO alphabet — Bravo, Charlie, Echo, Foxtrot, Golf, Hotel, India, Juliett, Kilo, Lima, Mike, November, Oscar, Papa, Quebec, Romeo, Tango, Uniform, Victor, Whiskey, X-ray, Yankee, Zulu — was chosen for distinctiveness over a radio, not for any connection to Greek. The words come from a mix of names, places, dance styles, and ordinary nouns.

Why "Alpha" and "Delta" Both?

The NATO drafters chose words that:

Sound distinct from each other (no rhymes, no confusable consonants).
Are recognizable to non-native English speakers.
Start with the correct letter or contain it prominently.
Have no offensive meaning in major languages.

"Alpha" and "Delta" survived all four tests and were already familiar from earlier spelling alphabets like the British RAF's "Able, Baker, Charlie..." (where A was Able and D was Dog). The shift to "Alpha" and "Delta" had nothing to do with reaching back to ancient Greek; the words just happened to win on phonetic grounds.

The Greek Alphabet, for Comparison

For reference, here's how the Greek alphabet differs in length, purpose, and form. See our full Greek alphabet page for letter details.

Position	Greek letter	Name	NATO word at same position
1	Α α	Alpha	Alpha (A)
2	Β β	Beta	Bravo (B)
3	Γ γ	Gamma	Charlie (C)
4	Δ δ	Delta	Delta (D)
5	Ε ε	Epsilon	Echo (E)
6	Ζ ζ	Zeta	(NATO has no Z at position 6)
...	...	...	...
24	Ω ω	Omega	(NATO has no 24th letter)

Earlier Spelling Alphabets

NATO didn't invent the idea of replacing letters with code-words; the practice is older than radio itself. Earlier systems include:

British Army Signal Service (1904): Ack, Beer, Charlie, Don, Edward, Freddy...
RAF/Joint Army-Navy (1941): Able, Baker, Charlie, Dog, Easy, Fox...
U.S. military "Able-Baker" (1941–1956): Same as RAF. Replaced because words like "Item" (I) and "King" (K) were too easily confused with German/Italian/Japanese names.
Civilian Aviation/ICAO (1951): First system designed with non-English speakers in mind; iterated to become the current NATO list.
NATO standardization (1956): Current list adopted. Officially called the International Radiotelephony Spelling Alphabet; "NATO phonetic alphabet" is the common nickname.

Common Confusions to Avoid

"What's the NATO word for beta?" — There isn't one. The Greek letter beta has no NATO counterpart. The NATO word at letter B is Bravo.
"Is omega in the NATO alphabet?" — No. The NATO alphabet has 26 code-words, one per Latin letter A–Z. It doesn't extend to Greek letters.
"Why is C 'Charlie' but not 'Gamma'?" — Because NATO is based on the Latin alphabet (A, B, C, D, ...). The Latin letter C derives historically from gamma (Γ), but they're distinct letters, and "Gamma" was rejected for being confusable with "Bravo."
Military operations named with Greek letters — separate convention. "Operation Sigma" or "Project Omega" are codename traditions distinct from the per-letter NATO phonetic system.

When Do People Mix Them Up?

The Greek/NATO confusion shows up in three common situations:

Sports and gaming team names: "Alpha squad" and "Delta squad" feel half-Greek, half-military. Both work because both alphabets use the words.
Software-version naming: Alpha, beta, gamma releases borrow from the Greek alphabet sequence — these stages are not from NATO. (Charlie release? Not a thing.)
WHO virus variants: SARS-CoV-2 variants Alpha, Beta, Gamma, Delta, Omicron use the Greek alphabet (and skip Nu and Xi). Not NATO.

Full Greek alphabet reference
Alpha letter page — etymology, uses, and the "alpha and omega" idiom.
Delta letter page
How to pronounce Greek letters