1889 Qajar-era map of Tehran showing the historical Persian spelling طهران

Tehran or Teheran? Why طهران Became تهران

Look at a Qajar-era map of Iran’s capital and the city’s name may seem almost—but not quite—familiar. Instead of today’s standard Persian spelling, تهران, older documents often write طهران. English archives may likewise use Teheran where modern maps use Tehran.

These forms all refer to the same city. But two separate questions are involved: why the first Persian letter changed from ط to ت, and why English writers once inserted an extra e. Understanding the difference reveals how Persian pronunciation, Arabic-script spelling, and Western romanization developed along different paths.

What is the modern spelling of Tehran in Persian?

The standard modern Persian spelling is تهران, read from right to left:

  • ت — te, representing a /t/ sound
  • ه — he
  • ر — re
  • ا — alef, marking the long vowel in the final syllable
  • ن — nun

English normally writes the name as Tehran. Scholarly transliteration may add a macron—Tehrān—to show that the final a is long. That mark is useful for linguistic precision but is not part of the city’s everyday English name.

What was the older Persian spelling?

For centuries, writers commonly began the name with ط, producing طهران. This first letter is Arabic ṭāʾ, conventionally transliterated as ṭ in academic writing.

The difference is visible on an 1889 Qajar map of Tehran created by Abdul Ghaffar Najm al-Mulk and published by Iran’s Ministry of Sciences. Its Persian title calls the city دارالخلافهٔ ناصرى طهران—the Naseri seat of government, Tehran. This is not a modern decorative revival; it is the spelling used on an official nineteenth-century map.

Encyclopaedia Iranica’s history of Tehran confirms that the initial ṭ remained the preferred choice in most documents until the early twentieth century. The city did not change names. Its conventional spelling changed.

Do ط and ت sound different in Persian?

In modern standard Persian, not in ordinary speech: both are pronounced /t/. The distinction belongs to the writing system and to the letters’ Arabic history, not to a contrast most Persian speakers make when pronouncing words.

Iranica’s study of Arabic elements in Persian explains that several Arabic consonants unfamiliar to Persian merged with the nearest Persian sounds. Arabic t and emphatic ṭ, written ت and ط, are both realized as /t/ in Persian.

Persian spelling still preserves both letters because many Arabic loanwords keep their Arabic forms. But when writing native Persian words, ت is normally the default. Iranica specifically identifies the older ط in طهران as a remnant of the form recorded by early Arabic geographers.

Why did طهران become تهران?

The careful answer is that usage gradually standardized around تهران; the evidence does not point to one dramatic renaming event. The older ط had historical authority because medieval Arabic-language geographers used it. Yet the name was Persian, and Tehran’s inhabitants pronounced its first sound as an ordinary /t/, not a distinct Arabic emphatic consonant.

As modern Persian spelling became more regular in print, education, administration, newspapers, and mapping, the native-Persian ت became the natural choice. That shift aligned the written form more closely with both pronunciation and the normal spelling of a Persian word.

This does not make طهران meaningless or “wrong.” In a historical quotation, facsimile, artwork, or Qajar-inspired design, it can be exactly appropriate. In a present-day address, school assignment, news article, or official form, تهران is the expected spelling.

Was the city pronounced “Tah-ran”?

The historical ط does not prove that speakers said “Tah-ran,” and the short vowels in Persian script are generally not written. Medieval sources already distinguished spelling from local pronunciation.

Iranica notes that the thirteenth-century geographer Yaqut used the Arabic-style initial letter while explicitly recognizing that the name was Persian and that local people pronounced it without the Arabic emphatic sound. The written ط, therefore, should not be treated as a phonetic recording of a special “ṭ” used by Tehranis.

Where did the English spelling “Teheran” come from?

Teheran is a historical English romanization, not a translation and not simply the Latin-letter equivalent of طهران. Persian normally omits short vowels in writing, so people converting a name into the Latin alphabet must decide how much pronunciation to show. Older European and English-language systems often wrote Teheran; modern usage generally favors the more compact Tehran.

The older English form remained common well into the twentieth century. The Library of Congress record for the 1943 wartime conference, for example, titles the event the “Teheran Conference,” while its modern subject heading cross-references Tehran, Iran. Other 1943 U.S. government photographs in the Library’s collection likewise caption the city as “Teheran.”

Because romanization conventions change, historical English spellings do not necessarily indicate that Persian speakers changed their pronunciation. They often tell us more about the conventions of the mapmaker, diplomat, cataloger, or publisher.

Does “Tehran” have a proven meaning?

No single etymology has been established. Popular explanations connect the name with ideas such as a “warm place,” an underground settlement, or a location below the older city of Ray. These stories are memorable, but Iranica reviews the competing proposals and concludes that they remain conjectural.

That uncertainty is worth preserving. A place name can be ancient and culturally powerful even when its original linguistic construction cannot be reconstructed with confidence. It is better to say “the origin is unresolved” than to turn an attractive theory into a fact.

A quick guide to the four forms

  • تهران — standard modern Persian spelling
  • طهران — historical Persian/Arabic-script spelling, common through the Qajar era and into the early twentieth century
  • Tehran — standard modern English spelling
  • Teheran — older English romanization still encountered in historical books, archives, and the name “Teheran Conference”

Why the older form still appears in design

Historical typography can carry a sense of period and place. Using طهران in a Qajar-inspired or archival design evokes the way the capital appeared in older maps and documents. Coordinates add a different layer: unlike changing spellings, they identify a location through geography.

Tute’s Tehran Coordinates Laptop Sleeve brings those ideas together in an everyday object: a city name with historical visual character, paired with a modern geographic identity.

For more stories behind Tehran’s landmarks and streets, explore why the Azadi Tower was originally called Shahyad, how Milad Tower became part of the skyline, and why Valiasr Street’s plane trees matter.

One city, several written histories

طهران, تهران, Teheran, and Tehran are not four cities. They are layers in the written history of one place. The older Persian letter reflects medieval Arabic geographical convention; the modern Persian form follows ordinary Persian spelling and pronunciation; and the two English forms reflect changing choices about romanization.

The next time طهران appears on an old map or cultural design, it can be read for what it is: not a typo, but a surviving trace of how Iran’s capital used to be written.

Sources and image credit

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