1938 U.S. National Championships – Women's singles
# 1938 U.S. National Championships – Women's singles

Second-seeded Alice Marble defeated Nancye Wynne 6–0, 6–3 in the final to win the women's singles tennis title at the 1938 U.S. National Championships.

## Seeds

The tournament used two lists of eight players for seeding the women's singles event; one for U.S. players and one for foreign players. Alice Marble is the champion; others show in brackets the round in which they were eliminated.

## Draw

### Final eight

| Quarterfinals | Quarterfinals | Quarterfinals | Quarterfinals | Quarterfinals | Semifinals | Semifinals | Semifinals | Semifinals | Semifinals | Finals | Finals | Finals | Finals |
| - | - | - | - | - | - | - | - | - | - | - | - | - | - |
| (6) | Margot Lumb | 4 | 7 | 1 | | | | | | | | | |
| (4) | Nancye Wynne | 6 | 5 | 6 | | | | | | | | | |
| (4) | Nancye Wynne | 6 | 5 | 6 | (4) | Nancye Wynne | 5 | 6 | 8 | | | | |
| | | | | | 3 | Dorothy Bundy | 7 | 4 | 6 | | | | |
| 3 | Dorothy Bundy | 6 | 3 | 6 | 3 | Dorothy Bundy | 7 | 4 | 6 | | | | |
| (2) | Simonne Mathieu | 3 | 6 | 0 | | | | | | | | | |
| (2) | Simonne Mathieu | 3 | 6 | 0 | | | | | | (4) | Nancye Wynne | 0 | 3 |
| | | | | | | | | | | 2 | Alice Marble | 6 | 6 |
| 2 | Alice Marble | 6 | 6 | 6 | | | | | | | | | | 2 | Alice Marble | 6 | 6 |
| (3) | Kay Stammers | 8 | 3 | 0 | | | | | | | | | |
| (3) | Kay Stammers | 8 | 3 | 0 | 2 | Alice Marble | 5 | 7 | 7 | | | | |
| | | | | | 4 | Sarah Fabyan | 7 | 5 | 5 | | | | |
| 4 | Sarah Fabyan | 6 | 6 | | 4 | Sarah Fabyan | 7 | 5 | 5 | | | | |
| (1) | Jadwiga Jędrzejowska | 1 | 4 | | | | | | | | | | |
