I love you! Io te ama!

Afrikaans: Ek is lief vir jou
Albanian: Te dua / Te dashuroj / Ti je zemra ime
Apache: Sheth sheng zhong
Arabic: Ana ba-heb-bak
Armenian: Yes kez guh seerem (Western) / Yes kez si'rumem (Eastern)
Bangladeschi: Ami tomake walobashi
Basque: Nere maitea
Bengali: Aami tomaake bhaalo baashi
Bolivian: Quechua Qanta munani
Bosnian: Volim te
Brazilian: (Portuguese): Eu te amo (pronounced "eiu chee amu")
Bulgarian: Obicham te / As te obeicham / As te obicham
Burmese: Chit pa te
Cambodian: Kh_nhaum soro_lahn nhee_ah
Canadian: (French): Sh'teme (spoken) / Je t'aime / Je t'adore
Cheyenne: Ne mohotatse
Chickasaw: Chi(ng)holloli
Chinese: Ngo oi ney / Wo oi ney (Cantonese) / Wo ai ni / Wo ie ni (Mandarin)
Creol: Mi aime jou
Croatian: Volim te (used in common speech)
Czech: Miluji te
Danish: Jeg elsker dig
Dutch: Ik hou van je / Ik hou van jou
Equador: Quechua: Canda munani
English: I love you
Esperanto: (artificial) Mi amas vin
Estonian: Mina armastan sind
Ethiopian: ewedishalew (m2f) / ewedihalew (f2m)
Farsi: (Iran-dialects in Afghanistan/Pakistan): Tora dost daram
Filipino: (Phillipino) Mahal ka ta / Iniibig kita / Mahal kita
Finnish: ("Ma") rakastan sinua / ("Ma") tykka"a"n susta (I like you)
French: Je t'aime / Je t'adore / J' t'aime bien
Gaelic: (Language of Ireland) Ta gra agam ort / Moo graugh hoo
German: Ich liebe dich (classic & conservative) / Ich hab dich lieb
German: (Swiss) Ch'ha di ga"rn
Greek: S'agapo
Greenlandic: Asavakit
Hawaiian: Aloha wau ia oi / Aloha wau ia oi nui loa (I love you very much)
Hebrew: Ani ohebh otakh
Hindi: (India): Mai tumase pyar karata hun (m2f) / Mai tumase pyar karati hun (f2m)
Hopi: Nu' umi unangw'ta
Hungarian: Szeretlek
Icelandic: Eg elska thig (pronounce "yeg l-ska thig")
Indonesia: Saya cinta padamu / Saya cinta kamu / Saya kasih saudari
Interlingua: Io te ama
Italian: Ti amo
Irish: (see also Gaelic): Taim i' ngra leat
Japanese: Kimi o ai shiteru / Aishiteru / Chuu shiteyo / Ore wa omae ga suki da / Watashi wa anata ga suki desu
Korean: Dangsinul saranghee yo / Saranghee / Joahaeyo / Norul sarang hae
Kurdish: Ez te hezdikhem
Ladino: (Judeo-Spanish): Te amo
Lao: Khoi hak jao
Latin: Te amo
Latvian: Es tevi milu
Lebanese: Bahibak
Luganda: (language of Uganda) / Tave myliu (ta-ve mee-lyu) / Nkwagala Nyo
Luo: (language of Kenya): Aheri
Luxembourgish: Ech hun dech ga"r
Macedonian: Te sakam / Te ljubam
Malay: (Indonesian): Saya cintakan kamu / Saya cinta pada mu
Mohawk: Konoronhkwa
Moroccan: Kanbhik
Navaho: Ayor anosh'ni
Norwegian: Jeg elsker deg (Bokmaal) / Eg elskar deg (Nynorsk)
Pakistani: Mujhe tumse muhabbat hai / Muje se mu habbat hai
Polish: Kocham cie / Kocham ciebie / Ja cie kocham / Yacha kocham
Portuguese: (Eu) te amo
Punjabi (language of N. Punjab, India) Main tainu pyar karna / Nai taunu pyar karda
Romanian: Te iubesc / Te ador
Russian: Ya tyebya lyublyu
Samoan: Ou te alofa outou
Serbian: (familiar) Volim te
Serbocroatian: Volim te / Ljubim te
Sioux: Techihhila
Slovak: Lubim ta
Spanish: Te amo / Te quiero
Srilankan: Mama oyata arderyi
Swahili: Nakupenda
Swedish: Jag a"lskar dig
Syrian/Lebanese: Bhebbek (m2f) / Bhebbak (f2m)
Tagalog (Philippines): Mahal kita
Tahitian: Ua here au ia oe / Ua here vau ia oe
Thai (Thailand): Chan raak ther
Tunisian: Ha eh bak
Turkish: Seni seviyorum
Ukranian: Ya tebe kokhayu / Ja pokokhav tebe
Urdu (Pakistan and India): Main tumse muhabbat karta hoon / Mujhe tumse mohabbat hai / Kam prem kartahai
Vietnamese: Anh ye^u em (m2f) / Em ye^u anh (f2m)
Welsh (Wales, UK): Rwy'n dy garu di
Yiddish: Ikh hob dikh lib / Ich libe dich / Ich han dich lib
Yugoslavian: Ja te volim
Zulu: Mena tanda wena / Ngiyakuthanda
Zuni: Tom ho' ichema