Ripped from Wikipedia:

Translations in widespread use

Most of these variants are usually found in lowercase.

* lal or lawl: can refer to either a pseudo-pronunciation of LOL, or the German translation (although most German speakers use LOL). Saying "lawl" is sometimes meant in mockery of those who use the term LOL, and not meant as serious usage.
* ｗ: used commonly in 2channel, a Japanese equivalent of the acronym. 'ｗ' stands for 笑う (わらう, warau), which means "to laugh" in Japanese.
* lolz: occasionally used in place of LOL.
* lulz: A corruption of LOL. Often used to denote humor at another person's expense. Can be used as a noun — e.g. "for the lulz" ("for laughs"/"for the hell of it"). According to a New York Times article about Internet trolling, "lulz means the joy of disrupting another's emotional equilibrium."[24] It is derived from the 4chan community.
* lqtm: Because often when behind a computer screen, one will find something funny, but not actually laugh out loud, lqtms or simply lqtm can be used, which stands for "laughing quietly to myself."[citation needed] This term was coined by stand-up comedian Demetri Martin.[citation needed]
* mdr: French version of the expression LOL, from the initials of "mort de rire" that roughly translated means "dying of laughter".
* חחחחח: Hebrew version of LOL. The letter ח is pronounced 'kh', and it is common to put a group of them together (the longer the group, the greater the amusement) to transcribe 'khkhkhkhkh' (a sound of chuckling). The word LOL is sometimes transliterated, but its usage is not very common.[citation needed]
* 555: The Thai variation of LOL. "5" in Thai is pronounced "ha", three of them being "hahaha".
* asg: Swedish abbreviation of the term Asgarv, meaning intense laughter.
* g: Danish abbreviation of the word griner, which means "laughing" in Danish.[citation needed]
* rs: in Brazil "rs" (being an abbreviation of "risos", the plural of "laugh") is often used in text based communications in situations where in English lol would be used, repeating it ("rsrsrsrsrs") is often done to express longer laughter or laughing harder.[citation needed]
* mkm: in Afghanistan "mkm" (being an abbreviation of the phrase "ma khanda mikonom"). This is a Dari phrase that means "I am laughing".[citation needed]
* In Chinese, although 大笑 (da xiao; "big laugh") is used, a more widespread usage is "哈哈哈" (ha ha ha) on internet forums.

Other languages

Lol is a native Dutch word (not an acronym) which, coincidentally, means "fun" ("lollig" means "funny").

In Welsh, lol means "nonsense" – e.g., if a person wanted to say "utter nonsense" in Welsh, they would say "rwtsh lol".[25]

and...

English: lol
Welsh: loll
French: lél
German: lähl!
Dutch: looijl
Swedish: löl
Scottish: lael
Greek: lollas
polak one is lolsk
Turkish: Lallah