The following organizations support World Vexillology Day.
Vexillology Ireland / Brateolaíocht Éireann (VIBE)
Hrvatsko grboslovno i zastavoslovno društvo (HGZD) / Croatian Heraldic and Vexillological Assocation
New England Vexillological Association (NEVA)
New Zealand Flag Association (NZFA)
Southern African Vexillological Association (SAVA)
Greater Unified Albany Vexillological Association (GUAVA)
Heraldica Slovenica (HS) / Heraldry Society of Slovenia
Associació Catalana de Vexil·lologia (ACV) / Catalan Association of Vexillology
Středisko vexilologických informací (SVI) / Flag Data Center
Centro Italiano Studi Vessillologici (CISV) / Italian Center of Vexillological Studies
North American Vexillological Association (NAVA) / Association nord-américaine de vexillologie
Sociedad Española de Vexilología (SEV) / Spanish Society of Vexillology
Polskie Towarzystwo Weksylologiczne (PTW) / Polish Vexillological Society
Indian Vexillological Association (IVA)
Société française de vexillologie (SFV) / French Society of Vexillology