| Invention or discovery | Date | Inventor or discoverer | Type |
|---|---|---|---|
| NGC 4489 | March 21, 1784 | William Herschel | elliptical galaxy |
| NGC 4502 | March 21, 1784 | William Herschel | spiral galaxy |
| NGC 4515 | March 21, 1784 | William Herschel | spiral galaxy |
| NGC 3412 | April 8, 1784 | William Herschel | lenticular galaxy |
| NGC 3498 | April 8, 1784 | William Herschel | galaxy |
| NGC 3800 | April 8, 1784 | William Herschel | intermediate spiral galaxy |
| NGC 3872 | April 8, 1784 | William Herschel | elliptical galaxy |
| NGC 4037 | April 8, 1784 | William Herschel | spiral galaxy |
| NGC 4168 | April 8, 1784 | William Herschel | elliptical galaxy |
| NGC 4189 | April 8, 1784 | William Herschel | intermediate spiral galaxy |
| NGC 4222 | April 8, 1784 | William Herschel | spiral galaxy |
| NGC 4419 | April 8, 1784 | William Herschel | spiral galaxy |
| NGC 4473 | April 8, 1784 | William Herschel | elliptical galaxy |
| NGC 4474 | April 8, 1784 | William Herschel | lenticular galaxy |
| NGC 4479 | April 8, 1784 | William Herschel | lenticular galaxy |
| NGC 4516 | April 8, 1784 | William Herschel | spiral galaxy |
| NGC 3559 | April 12, 1784 | William Herschel | spiral galaxy |
| NGC 4443 | April 12, 1784 | William Herschel | lenticular galaxy |
| NGC 4478 | April 12, 1784 | William Herschel | elliptical galaxy |
| NGC 4659 | April 12, 1784 | William Herschel | lenticular galaxy |
| NGC 3914 | April 13, 1784 | William Herschel | radio galaxy |
| NGC 3976 | April 13, 1784 | William Herschel | spiral galaxy |
| NGC 4180 | April 13, 1784 | William Herschel | astrophysical X-ray source |
| NGC 4197 | April 13, 1784 | William Herschel | spiral galaxy |
| NGC 4215 | April 13, 1784 | William Herschel | lenticular galaxy |
| NGC 4223 | April 13, 1784 | William Herschel | lenticular galaxy |
| NGC 4224 | April 13, 1784 | William Herschel | spiral galaxy |
| NGC 4246 | April 13, 1784 | William Herschel | spiral galaxy |
| NGC 4264 | April 13, 1784 | William Herschel | lenticular galaxy |
| NGC 4296 | April 13, 1784 | William Herschel | lenticular galaxy |
| NGC 4326 | April 13, 1784 | William Herschel | intermediate spiral galaxy |
| NGC 4333 | April 13, 1784 | William Herschel | spiral galaxy |
| NGC 4341 | April 13, 1784 | William Herschel | lenticular galaxy |
| NGC 4342 | April 13, 1784 | William Herschel | lenticular galaxy |
| NGC 4370 | April 13, 1784 | William Herschel | spiral galaxy |
| NGC 4423 | April 13, 1784 | William Herschel | spiral galaxy |
| NGC 4532 | April 13, 1784 | William Herschel | galaxy |
| NGC 4588 | April 13, 1784 | William Herschel | spiral galaxy |
| NGC 4623 | April 13, 1784 | William Herschel | elliptical galaxy |
| NGC 3833 | April 15, 1784 | William Herschel | spiral galaxy |
| NGC 3876 | April 15, 1784 | William Herschel | spiral galaxy |
| NGC 4442 | April 15, 1784 | William Herschel | lenticular galaxy |
| NGC 4598 | April 15, 1784 | William Herschel | lenticular galaxy |
| NGC 3388 | April 17, 1784 | William Herschel | lenticular galaxy |
| NGC 3681 | April 17, 1784 | William Herschel | spiral galaxy |
| NGC 3684 | April 17, 1784 | John Frederick William Herschel | spiral galaxy |
| NGC 3790 | April 17, 1784 | William Herschel | lenticular galaxy |
| NGC 3968 | April 17, 1784 | William Herschel | spiral galaxy |
| NGC 4193 | April 17, 1784 | William Herschel | spiral galaxy |
| NGC 4200 | April 17, 1784 | William Herschel | lenticular galaxy |
| NGC 4425 | April 17, 1784 | William Herschel | lenticular galaxy |
| NGC 4431 | April 17, 1784 | William Herschel | lenticular galaxy |
| NGC 4436 | April 17, 1784 | William Herschel | lenticular galaxy |
| NGC 4440 | April 17, 1784 | William Herschel | spiral galaxy |
| NGC 4454 | April 17, 1784 | William Herschel | lenticular galaxy |
| NGC 4531 | April 17, 1784 | William Herschel | lenticular galaxy |
| NGC 4602 | April 17, 1784 | William Herschel | spiral galaxy |
| NGC 4684 | April 17, 1784 | William Herschel | lenticular galaxy |
| NGC 4691 | April 17, 1784 | William Herschel | lenticular galaxy |
| NGC 3535 | April 18, 1784 | William Herschel | spiral galaxy |