| 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 | |
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.