| Denomination: | One leu |
| Country: | Romania |
| Value: | 1 |
| Unit: | Romanian leu |
| Width Mm: | 120 |
| Height Mm: | 62 |
| Security Features: | watermark, security thread, transparent window, microprinting, blacklight printing, EURion constellation |
| Paper Type: | polymer |
| Years Of Printing: | since 2005 |
| Obverse: | Romanian 1-Leu bill (front).jpg |
| Obverse Design: | prof. Nicolae Iorga, Milkweed gentian |
| Obverse Designer: | National Bank of Romania |
| Obverse Design Date: | 2005 |
| Reverse: | 1 leu. Romania, 2005 b.jpg |
| Reverse Design: | Curtea de Argeş Cathedral, the Wallachian eagle |
| Reverse Designer: | National Bank of Romania |
| Reverse Design Date: | 2005 |
The current one leu banknote is the smallest circulating denomination of the Romanian leu. It is the same size as the 5 Euro banknote.
The main color of the current banknote is green. It pictures, on the obverse Prime-minister and historian Nicolae Iorga, and on the reverse the Curtea de Argeş Cathedral, which suffered a massive restoration under his Government, and a crossed eagle, the Wallachian traditional heraldic element.
In the past, the denomination was also in the coin form, as follows:
First leu (1867-1947)
Second leu (1947-1952)
Third leu - ROL(1952-2005)
Fourth leu - RON (since 2005)