These are the banks in Belgium you can connect to Vault. They connect through Enable Banking; see Connecting a European bank for how that works.
The bank search in the app is always the most up-to-date list. Banks are listed under their official names, which can differ from the brand you know, so try the name of its group or its town too. Still not there? See If your bank is not in the list.
ABN AMRO
Aion
Argenta
Bank J.Van Breda & C°
Banque CPH
Banque de Luxembourg
Banque Transatlantique
BBVA
Belfius
Beobank
BNP Paribas Fortis
bunq
CBC Banque
Crelan
Deutsche Bank
DiPocket
Europabank
Finductive
Genome
HSBC
iBanFirst
ING
ING Wholesale Banking
Intesa Sanpaolo Wealth Management
KBC Bank
Keytrade Bank
Klarna
N26
Nagelmackers
PayPal
Revolut
Société Générale Global Cash
Sumeria
Triodos Bank
Van Lanschot
vdk bank
Viva.com
Wamo
Wise