An enzyme that oxidizes an aldehyde in the presence of NAD+ and water to an acid and NADH. This enzyme was formerly classified as EC 1.1.1.70. (mesh:D000444)
| Synonym | Reference | Specificity |
| Aldehyde dehydrogenase | Exact | |
| aldehyde dehydrogenase | Exact | |
| aldehyde dehydrogenase (NAD+) | Exact | |
| ALDH | Exact |
| Identifier | Name | Relation |
| HGNC:403 | ALDH3A2 | isa |
| HGNC:405 | ALDH3A1 | isa |
| HGNC:15472 | ALDH1A2 | isa |
| HGNC:409 | ALDH1A3 | isa |
| HGNC:402 | ALDH1A1 | isa |
| HGNC:412 | ALDH9A1 | isa |
| HGNC:408 | ALDH5A1 | isa |
| HGNC:404 | ALDH2 | isa |
| HGNC:410 | ALDH3B1 | isa |
| HGNC:877 | ALDH7A1 | isa |