Democrats 66 Representation Representation

| Year_ | Lijsttrekker | Fractievoorzitter | Cabinet | Chair |
|---|---|---|---|---|
| 1966 | no elections | none | extra-parliamentary | Hans van Mierlo |
| 1967 | Hans van Mierlo | Hans van Mierlo | opposition | G. Ringalda |
| 1968 | no elections | Hans van Mierlo | opposition | H.J. Lookeren-Campagne |
| 1969 | no elections | Hans van Mierlo | opposition | J.A.P.M. Beekmans |
| 1970 | no elections | Hans van Mierlo | opposition | J.A.P.M. Beekmans |
| 1971 | Hans van Mierlo | Hans van Mierlo | opposition | J.A.P.M. Beekmans |
| 1972 | no elections | Jan Terlouw | Hans Gruijters | R.E. van der Scheer-van Essen |
| 1973 | no elections | Jan Terlouw | Hans Gruijters | J. ten Brink |
| 1974 | no elections | Jan Terlouw | Hans Gruijters | J. ten Brink |
| 1975 | no elections | Jan Terlouw | Hans Gruijters | J. ten Brink |