| Date: | February 18–24 |
| Edition: | 21st |
| Prize Money: | $600,000 |
| Draw: | 48S / 24D |
| Category: | Championship Series |
| Surface: | Hard / indoor |
| Location: | Memphis, U.S. |
| Champs: |  Ivan Lendl[1] |
| Champd: | Udo Riglewski / Michael Stich[2] |
| Before Name: | Volvo U.S. National Indoor |
| After Name: | Federal Express International |
| Main Name: | U.S. National Indoor Championships |
The 1991 Volvo Tennis Indoor was a men's tennis tournament played on indoor hard courts that was part of the Championship Series of the 1991 ATP Tour. It was the 21st edition of the tournament and tt took place in Memphis, Tennessee, United States, from February 18 through February 24, 1991. First-seeded Ivan Lendl, who entered on a wildcard, won the singles title and earned $99,000 first-prize money.[3] [4]
See main article: 1991 Volvo Tennis Indoor – Singles. Ivan Lendl defeated Michael Stich, 7–5, 6–3
See main article: 1991 Volvo Tennis Indoor – Doubles. Udo Riglewski / Michael Stich defeated 
John Fitzgerald / Laurie Warder, 7–5, 6–3