frikaans
Ek het jou liefe Ek is lief vir jou

Albanian
te dua te dashuroj

Alentejano(Portugal)
Gosto De Ti, Porra!

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)
Bahibak (female to male)
Arabic (not standard)
Bahibik (male to female)
Benhibak (more than one male or female to male)
Benhibik (male to male or female to female)
Benhibkom (m. to m. or female to more than one male)
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
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

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)

Chinese
(see the entries for mandarin or cantonese!)

Corsican
Ti tengu cara (to female)
Ti tengu caru (to male)

Croatian
ja te volim

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
I adore you

Esperanto
Mi amas vin

Estonian
Mina armastan sind
Ma armastan sind

Farsi
Tora dust midaram
Asheghetam doostat dAram

Filipino
Mahal kita
Iniibig Kita

Finnish
Minä 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')

Greek (old)
(Ego) philo su (ego is only needed for emphasis)

Greenlandic
Asavakit

Gujrati
Hoon tane pyar karoochhoon.

Hausa
Ina sonki

Hawaiian
Aloha I'a Au 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)

Hessian
Ei, isch du Disch doch liebbe, gelle

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

Hungarian
Szeretlek
Szeretlek te'ged

Icelandic
Eg elska thig

Indi
Mai Tujhe Pyaar
Kartha Ho

Indonesian
Saya cinta padamu (Saya, commonly used)
Saya cinta kamu ( " )
Saya kasih saudari ( " )
Aku tjinta padamu (Aku, not often used)
Aku cinta padamu ( " )
Aku cinta kamu ( " )

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)
Kulo tresno

Kannada
Naanu Ninnanu
Preethisuthene
Naanu Ninnanu
Mohisuthene

Kiswahili
Nakupenda

Klingon
Qabang qaparHa' (depends where in the galaxy you are)