Here are the ways to say "I love you" in many languages.

LANGUAGE	I LOVE YOU	COMMENTS
Afrikaans	Ek het jou liefe Ek is lief vir jou
Albanian	te dua te dashuroj
Alentejano	Gosto De Ti, Porra!	Portugal
Alsacien	Ich hoan dich gear
Amharic	Afekrishalehou
Arabic	Ana Behibak (to a male) Ana Behibek (to a female) Ib'n hebbak. Ana Ba-heb-bak nhebuk Ohiboke (male to female) Ohiboka (female to male) Ohibokoma (male or female to two males or two females) Nohiboke (more than one male or female to female) Nohiboka (male to male or female to male) Nohibokoma (m. to m. or f. to two males or two females) Nohibokom (m. to m. or f. to more than two males) Nohibokon (m. to m. or f. to more than two females) (not standard) Bahibak (female to male) (not standard) Bahibik (male to female) (not standard) Benhibak (more than one male or female to male) (not standard) Benhibik (male to male or female to female) (not standard) Benhibkom (m. to m. or female to more than one male)
Armenian	Siroum em kez	Thanks Mike
Assamese	Moi tomak bhal pau
Basc	Nere Maitea
Batak	Holong rohangku di ho
Bavarian	I mog di narrisch gern
Bengali	Ami tomAy bhAlobAshi Ami tomake bhalobashi.
Berber	Lakh tirikh
Bicol	Namumutan ta ka
Bolivian	Quechua qanta munani
Bulgarian	Obicham te
Burmese	chit pa de
Cambodian a.k.a. Khmer	Bon sro lanh oon kh_nhaum soro_lahn nhee_ah
Canadian French	Sh'teme (spoken, sounds like this)
Cantonese	Moi oiy neya Ngo oi ney	Chinese
Catalan	T'estim (mallorcan) T'estim molt (I love you a lot) T'estime (valencian) T'estimo (catalonian)
Cebuano	Gihigugma ko ikaw.
Chickasaw	chiholloli (first "i" nasalized)	American Indian
Chinese	(see the entries for mandarin or cantonese!)
Corsican	Ti tengu cara (to female) Ti tengu caru (to male)
Creole (Haitian)	Mwen renmen ou. The "en" is pronounced as the French "in" nasal sound. The "ou" is pronounced as in the French "ou" or the English "oo".	Thanks to Dan
Croatian & Serbian	Ljubim te "means to kiss you" Ya te volim "I love you" or Volim te "I love you"	Thanks to tanya karlovic for corrections
Czech	miluji te MILUJU TE! (colloquial form)
Danish	Jeg elsker dig
Dutch	Ik hou van jou Ik ben verliefd op je
Ecuador	Quechua canda munani
English	I love you
Esperanto	Mi amas vin
Estonian	Mina armastan sind Ma armastan sind
Farsi	Tora dust midaram Asheghetam (Persian) doostat dAram
Filipino	Mahal ki ta Iniibig Kita
Finnish	Mina" rakastan sinua
Flemish	Ik zie oe geerne
French	Je t'aime Je t'adore
Friesian	Ik hald fan dei
Gaelic	Ta gra agam ort
German	Ich liebe Dich
Greek	s'ayapo (spoken s'agapo, 3rd letter is lower case'gamma') (old) (Ego) philo su (ego is only needed for emphasis)
Greenlandic	Asavakit
Gujrati	Hoon tane pyar karoochhoon.
Hausa	Ina sonki
Hawaiian	Aloha wau 'ia oe
Hebrew	Ani ohev otach (male to female) Ani ohev otcha (male to male) Ani ohevet otach (female to female) Ani ohevet otcha (female to male)
Hindi	Mai tumase pyar karata hun (male to female) Mai tumase pyar karati hun (female to male) Main Tumse Prem Karta Hoon Mai Tumhe Pyar Karta Hoon Main Tumse Pyar Karta Hoon Mai Tumse Peyar Karta Hnu Mai tumse pyar karta hoo
Hokkien	Wa ai lu
Hopi	Nu' umi unangwa'ta	American Indian
Hungarian	Szeretlek Szeretlek te'ged
Icelandic	Eg elska thig
Indi	Mai Tujhe Pyaar Kartha Ho
Indian Meitei Language	Ei Nungbu Nungshi (I love You} Ei nungbu yamna nungshi (I love you a lot)	Courtresy of Sanahal Y.
Indonesian	Saya sayang padamu (Saya, commonly used) Saya cinta kamu (Aku is used more commonly among the younger generations) Aku sayang padamu Aku cinta kamu	Courtresy of V.
Iranian	Mahn doostaht doh-rahm
Irish	taim i' ngra leat
Italian	ti amo (if it's a relationship/lover/spouse) ti voglio bene (if it's a friend, or relative)
Japanese	Kimi o ai shiteru Aishiteru Chuu shiteyo Ora omee no koto ga suki da Ore wa omae ga suki da Suitonnen Sukiyanen Sukiyo Watashi Wa Anata Ga Suki Desu Watashi Wa Anata Wo Aishithe Imasu Watakushi-wa anata-wo ai shimasu Suki desu (used at 1st time, like for a start, when you are not yet real lovers)
Javanese	Kulo tresno
Kalenjin	Achamin
Kannada	Naanu Ninnanu Preethisuthene Naanu Ninnanu Mohisuthene
Kiswahili	Nakupenda
Korean	No-rul sarang hae (man to woman in casual relationship) Tangsinul sarang ha yo Tangshin-ul sarang hae-yo Tangsinul Sarang Ha Yo Tangshin-i cho-a-yo (i like you, in a romantic way) Nanun tangshinul sarang hamnida Nanun Dangsineul Mucheog Joahapnida Nanun Dangsineul Saranghapnida Nanun Gdaega Joa Nanun Gdaereul Saranghapnida Nanun Neoreul Saranghanda Gdaereul Hjanghan Naemaeum Alji Joahaeyo Saranghae Saranghaeyo Saranghapanida
Kurdish	Ez te hezdikhem (?)
Lao	Koi muk jao Khoi huk chau
Latin	Te amo Vos amo (old) (Ego) amo te (ego, for emphasis)
Latvian	Es milu tevi (Pronounced "Ess tevy meeloo")
Lebanese	Bahibak
Lingala	Nalingi yo
Lisbon lingo	gramo-te bue', chavalinha
Lithuanian	TAVE MYLIU (ta-ve mee-lyu)
Lojban	mi do prami
Luo	Aheri
Macedonian	TE SAKAM!	Thanks Marija
Madrid lingo	Me molas, tronca
Malay/ Indonesian	Saya sayang padamu (Saya, commonly used) Saya cinta kamu (Aku is used more commonly among the younger generations) Aku sayang padamu Aku cinta kamu
Malayalam	Njyaan Ninne' Preetikyunnu Njyaan Ninne' Mohikyunnu. Ngan Ninne Snaehikkunnu
Malaysian	Saya Cintamu Saya Sayangmu Saya Cinta Kamu
Mandarin	Wo ai ni (Wo3 ai4 ni3 in tonal notation)	Chinese
Marathi	me tujhashi prem karto (male to female) me tujhashi prem karte (female to male) Mi tuzya var prem karato
Mohawk	Konoronhkwa	American Indian
Navaho	Ayor anosh'ni	American Indian
Ndebele	Niyakutanda
Norwegian	Eg elskar deg (Nynorsk) Jeg elsker deg (Bokmaal) (pronouncedyai elske dai)
Op Op	Lopveop Yopuop
Pakistani	Mujhe Tumse Muhabbat Hai
Persian	Tora dost daram
Pig Latin	Ie Ovele Ouye
Polish	Kocham Cie Ja cie kocham Yacha kocham Kocham Ciebie
Portuguese	Amo-te (brazilian) Eu te amo
Punjabi	Mai taunu pyar karda Main Tainu Pyar Karna
Quenya	Tye-mela'ne
Romanian	Te iu besc Te Ador
Russian	Ya vas liubli Ya tebya liubliu Ya polubeel s'tebya (malincaya) Ya Tibieh Lublue
Scot Gaelic	Tha gra\dh agam ort
Serbian	Ya te volim "I love you" or Volim te "I love you"	Thanks to tanya karlovic for corrections
Serbocroatian	Volim te Ljubim te
Shona	Ndinokuda	American Indian
Sinhalese	Mama oyata adarei
Sioux	Techihhila	American Indian
Slovak	lubim ta
Slovene	ljubim te
Somali	kujali
Spanish	Te amo
Srilankan	Mama Oyata Arderyi
Swahili	Naku penda (followed by the person's name)
Swedish	Jag a"lskar dig
Swiss - German	Ch'ha di ga"rn
Syrian/ Lebanese	BHEBBEK (to a female) BHEBBAK (to a male)
Tagalog	Mahal kita	Phillipines
Tahitian	Ua Here Vau Ia Oe
Tamil	Ni yaanai kaadli karen (You love me) n^An unnaik kAthalikkinREn (I love you) Naan Unnai Kadalikiren
Tcheque	MILUJI TE^
Telugu	Neenu ninnu pra'mistu'nnanu
Telugu/ india	Nenu Ninnu Premistunnanu
Thai	Phom Rak Khun (formal, male to female) Ch'an Rak Khun (formal, female to male) Khao Raak Thoe (affectionate, sweet, loving) Phom Rak Khun
Tunisian	Ha eh bak *
Turkish	Seni seviyo*rum (o* means o) Seni Seviyurum Seni Seviyorum
Turkmen	Men seny soyarin
Ukrainian	ja tebe koKHAju (real true love) ja vas koKHAju ja pokoKHAv tebe ja pokoKHAv vas
Urdu	Mujhe tumse mohabbat hai Main Tumse Muhabbat Karta Hoon
Uzbek	Man seni sevaman
Vietnamese	Em ye^u anh (woman to man) Toi yeu em Anh ye^u em (man to woman)
Vlaams	Ik hou van je Ik zie je graag	Thanks Thierry Boeve for correction!
Welsh	'Rwy'n dy garu di. Yr wyf i yn dy garu di (chwi)
Yiddish	Ich libe dich Ich han dich lib Ikh Hob Dikh Lib
Yugoslavian	Ja te volim
Zazi	Ezhele hezdege (sp?)
Zulu	Mena Tanda Wena Ngiyakuthanda! Tom ho' ichema