| Name sister association | City |
| A.S.R. Blok | Amsterdam |
| A.S.R. Hors | Amsterdam |
| E.S.R.V. Concorde | Eindhoven |
| D.R.V. Hippocampus | Enschede |
| Centaur | Gent |
| G.S.P.V. Parafrid | Groningen |
| N.S.R.V. Jolly Jumper | Nijmegen |
| R.S.R. Marcroix | Rotterdam |
| U.S.R. Hippeia | Utrecht |
| V.S.R. de Solleysel | Utrecht |
| A.W.S.R. Hipac St. Joris | Wageningen |
| N.S.R. HOP | Landelijk |
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