The 1991 Fernleaf Butter Classic was a women's tennis tournament played on outdoor hard courts at the Wellington Renouf Tennis Centre in Wellington, New Zealand, and was part of the Tier V category of the 1991 WTA Tour.

It was the fourth edition of the tournament and was held from 4 February until 10 February 1991.

First-seeded Leila Meskhi won the singles title and earned $18,000 first-prize money.

[1][2] Leila Meskhi defeated Andrea Strnadová 3–6, 7–6(7–3), 6–2 Jo-Anne Faull / Julie Richardson defeated Belinda Borneo / Clare Wood 2–6, 7–5, 7–6(7–4)