How do you say Happy Birthday in Flemish?

Yep, just as the person above me wrote, they speak Dutch (with some minor, insignificant differences) in Belgium. I would personally go for "van harte gefeliciteerd met je verjaardag".

Happy Birthday In Flemish

Flemish isn't a language. People who are Flemish speak Dutch. Gelukkige verjaardag = HB in Dutch.

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Afrikaans Gelukkige Verjaarsdag Albanian Gëzuar Ditëlindjen Aleut Raazdinyaam Ugutaa Amharic መልከም ልደት (melekame lidete) Arabic (Modern Standard) (kul sana wa inta tayyeb) كل سنة و انت طيب (kul ʿam wa inta bihair) كل عام و أنت بخير Arabic (Egyptian) (kull sana wa inta tayyib >m, kull sana wa inti tayyiba >f) كل سنة و إنت طيّب response - (wa inta tayyib >m, wa inti tayyiba >f) و إنت طيّب Armenian Ծնունդը շնորհավոր (Tsnundĕ shnorhavor) Aromanian Ti multsã-anji! Uràri cu-ucazea-a dzuùãljei di-aflari Azerbaijani Ad günün mübarək Basque Zorionak zuri Belarusian З днём нараджэння (Z dniom naradžennia) Bengali সুভজন্মদন্ (subho janmadin) Bosnian Sretan rođendan Breton Deiz ha bloaz laouen Kalz a vloavezhioù all Bulgarian Честит рожден ден (Čestit rožden den) Catalan Per molts anys Bon aniversari Moltes Felicitats Cebuano Maayong pagsaulog sa adlaw nga natawhan (formal - Happy Birthday is also used) Chechen Deeqhal xyyl vinde Chinese (Cantonese) 生日快樂 (sàangyaht faailohk) Chinese (Hakka) 生日快樂 (sang niyt khwài lók) Chinese (Hokkien) 生日快樂 (Sen-jít khoài-lók) Chinese (Mandarin) 生日快樂 [生日快乐] (shēngrì kuàilè) Chinese (Shanghainese) 生日快乐 (sinni kualoq) Cornish Penn-bloedh Lowen, Pedn bluth looan tha whye Croatian Sretan rođendan Czech Všechno nejlepší k narozeninám! Danish Tillykke med fødselsdagen Divehi (ufaaveri ufandhuvaheh) އުފާވެރި އުފަންދުވަހެއް Dutch Gefeliciteerd met je verjaardag, Gelukkige verjaardag, Fijne Verjaardag, Van Harte Gefeliciteerd [met je verjaardag] Esperanto Feliĉan datrevenon Feliĉan naskiĝtagon, Feliĉan naskiĝfeston Estonian Palju õnne sünnipäevaks Faroese Tillukku við føðingardegnum Finnish Hyvää syntymäpäivää Flemish Gelukkige verjaardag French Joyeux anniversaire Bon anniversaire Bonne fête (in Quebec) Gaelic (Irish) Breithlá Sona Duit Lá Breithe Sona Duit Gaelic (Manx) Laa-ruggyree sonney dhyt Gaelic (Scottish) Là breith sona dhuit/dhuibh Georgian გილოცავ(თ) დაბადების დღეს (gilocʻav(tʻ) dabadebis dġes) German Alles Gute zum Geburtstag Herzlichen Glückwunsch zum Geburstag Greek Χρόνια πολλά (Hrónia Pollá) Hawaiian Hauʻoli Lā Hānau Hebrew (Yom Huledet Sameakh) יום הולדת שמח Hindi जन्मदिन मुबारक हो (janmadina mubārak ho) सालगिरह की हार्दिक शुभकामनायें (sālgirah kī hārdik śubhkāmnāyeṅ) Hungarian Boldog születésnapot Icelandic Til hamingju með afmælið Ido Bona / Felica nasko-dio Indonesian Selamat ulang tahun Interlingua Felice anniversario Italian Buon compleanno Japanese お誕生日おめでとうございます (otanjōbi omedetō gozaimasu) Jèrriais Bouôn annivèrsaithe Kazakh Туған күнің құтты болсын! (Twğan küniñ quttı bolsın!) - inf Туған күніңіз құтты болсын! (Twğan küniñiz quttı bolsın!) - frm Klingon qoSlIj DatIvjaj Korean 생일축하합니다 (saengil chukha hamnida) Kyrghyz Туулган күнүң менен (Tuulgan kunun menen) Latin Felix dies natalis, Felix sit natalis dies Latvian Apsveicu dzimšanas dienā Limburgish Gelökkige verjaordaag Lipen Søerjehn (Festoy Nensktag) Lithuanian Sveikinu gimtadienio proga Lojban terjbe.ui Luxembourgeois E schéine Gebuertsdag Malay Selamat hari jadi, Selamat hari lahir Malayalam Janma Dina Ashamsakal Māori Rā whānau koa! Kia huritau ki a koe! Marathi वाढदिवसाच्या हार्दिक शुभेच्छा (vāḍhivsācyā hārdik śubhecchā) Mongolian Tєрсєн єдрийн баяр хvргэе (Tersen edriin bayar hurgeye) Norwegian Gratulerer med dagen Gratulerer med fødselsdagen Persian تولدت مبارک (tavallodet mobārak) Polish Wszystkiego najlepszego z okazji urodzin Wszystkiego najlepszego! Portuguese Parabéns Feliz aniversário Romanian La mulţi ani Russian С днем рождения (S dniom roždenija) Sabethir (Erathie'hyavras) Serbian Срећан рођендан (Srećan rođendan) Sindarin Nostor veren Slovak Všetko najlepšie (k narodeninám) Slovenian Vse najboljše (za rojstni dan) Spanish ¡feliz cumpleaños! Swedish Grattis på födelsedagen Tagalog Maligayang kaarawán Thai สุขสันต์วันเกิด (sook sun wan gerd) Turkish Doğum günün kutlu olsun Ukrainian Многая Літа (Mnohaja Lita) = "Many Years" З днем народження (Z dnem narodžennia) Urdu (sālgirah mubarak) سالگِرہ مبارک Uzbek Tug'ilgan kuningiz bilan! Vietnamese Chúc mừng sinh nhật Volapük Motöfadeli yofik Welsh Penblwydd Hapus Xhosa Ube nemini yokuzalwa emnandi Yiddish A freylakhn geburtstog / mazl-tov tsu dayn geburtstog Zulu Usuku lokuzalwa olumnandi My source will help you prononce them too!!!