The 1991 Croatian Lottery Cup, also known as the Croatian Lottery Cup – Bol Ladies Open was a women's tennis tournament played on outdoor clay courts in Bol, Yugoslavia that was part of Tier V of the 1991 WTA Tour. It was the inaugural edition of the tournament and was held from 22 April through 28 April 1991. Second-seeded Sandra Cecchini won the singles title.
| 1991 Croatian Lottery Cup | |
|---|---|
| Date | 22–28 April |
| Edition | 1st |
| Category | Tier V |
| Draw | 32S / 16D |
| Prize money | $100,000 |
| Surface | Clay / outdoor |
| Location | Bol, Yugoslavia |
| Champions | |
| Singles | |
 Sandra Cecchini | |
| Doubles | |
Laura Golarsa /  Magdalena Maleeva | |
Finals edit
Singles edit
Sandra Cecchini defeated Magdalena Maleeva 6–4, 3–6, 7–5
- It was Cecchini's only singles title of the year and the 11th of her career.
Doubles edit
Laura Golarsa / Magdalena Maleeva defeated Sandra Cecchini / Laura Garrone 6–3, 1–6, 6–4
- It was Golarsa's only doubles title of the year and the 2nd of her career. It was Maleeva's only doubles title of the year and 1st of her career.