| Invention or discovery | Date | Inventor or discoverer | Type |
|---|---|---|---|
| NGC 358 | February 4, 1865 | Heinrich Louis d'Arrest | open cluster |
| NGC 2503 | February 17, 1865 | Albert Marth | spiral galaxy |
| NGC 2553 | February 17, 1865 | Albert Marth | spiral galaxy |
| NGC 2556 | February 17, 1865 | Albert Marth | lenticular galaxy |
| NGC 2790 | February 17, 1865 | Albert Marth | radio galaxy |
| NGC 2801 | February 17, 1865 | Albert Marth | spiral galaxy |
| NGC 2812 | February 17, 1865 | Albert Marth | lenticular galaxy |
| NGC 2813 | February 17, 1865 | Albert Marth | lenticular galaxy |
| NGC 2879 | February 27, 1865 | Heinrich Louis d'Arrest | galaxy |
| NGC 2884 | February 27, 1865 | Heinrich Louis d'Arrest | lenticular galaxy |
| NGC 787 | February 27, 1865 | Christian Heinrich Friedrich Peters | spiral galaxy |
| NGC 3592 | March 4, 1865 | Albert Marth | spiral galaxy |
| NGC 3598 | March 4, 1865 | Albert Marth | lenticular galaxy |
| NGC 3602 | March 4, 1865 | Albert Marth | spiral galaxy |
| NGC 4056 | March 18, 1865 | Albert Marth | elliptical galaxy |
| NGC 4060 | March 18, 1865 | Albert Marth | lenticular galaxy |
| NGC 4483 | March 19, 1865 | Heinrich Louis d'Arrest | lenticular galaxy |
| NGC 3326 | March 22, 1865 | Albert Marth | radio galaxy |
| NGC 3337 | March 22, 1865 | Albert Marth | lenticular galaxy |
| NGC 3362 | March 22, 1865 | Albert Marth | astronomical radio source |
| NGC 3601 | March 22, 1865 | Albert Marth | intermediate spiral galaxy |
| NGC 3641 | March 22, 1865 | Albert Marth | elliptical galaxy |
| NGC 3644 | March 22, 1865 | Albert Marth | spiral galaxy |
| NGC 3647 | March 22, 1865 | Albert Marth | elliptical galaxy |
| NGC 4538 | March 22, 1865 | Albert Marth | spiral galaxy |
| NGC 4207 | March 23, 1865 | Heinrich Louis d'Arrest | spiral galaxy |
| NGC 3417 | March 25, 1865 | Albert Marth | spiral galaxy |
| NGC 3438 | March 25, 1865 | Albert Marth | radio galaxy |
| NGC 3439 | March 25, 1865 | Albert Marth | spiral galaxy |
| NGC 3526 | March 25, 1865 | Albert Marth | spiral galaxy |
| NGC 4029 | March 25, 1865 | Albert Marth | spiral galaxy |
| NGC 4082 | March 25, 1865 | Albert Marth | lenticular galaxy |
| NGC 4083 | March 25, 1865 | Albert Marth | lenticular galaxy |
| NGC 2576 | March 29, 1865 | Albert Marth | spiral galaxy |
| NGC 2594 | March 29, 1865 | Albert Marth | lenticular galaxy |
| NGC 2611 | March 29, 1865 | Albert Marth | radio galaxy |
| NGC 2747 | March 29, 1865 | Albert Marth | spiral galaxy |
| NGC 2761 | March 29, 1865 | Albert Marth | radio galaxy |
| NGC 2934 | April 2, 1865 | Albert Marth | lenticular galaxy |
| NGC 3349-2 | April 3, 1865 | Albert Marth | radio galaxy |
| NGC 4493-1 | April 3, 1865 | Albert Marth | galaxy |
| NGC 3186-1 | April 6, 1865 | Albert Marth | Seyfert 1 galaxy |
| NGC 4320 | April 15, 1865 | Heinrich Louis d'Arrest | spiral galaxy |
| NGC 4306 | April 16, 1865 | Heinrich Louis d'Arrest | lenticular galaxy |
| NGC 4523 | April 19, 1865 | Heinrich Louis d'Arrest | spiral galaxy |
| NGC 2277 | April 20, 1865 | Heinrich Louis d'Arrest | galaxy |
| NGC 2284 | April 20, 1865 | Heinrich Louis d'Arrest | galaxy |
| NGC 2285 | April 20, 1865 | Heinrich Louis d'Arrest | galaxy |
| NGC 4408 | April 21, 1865 | Heinrich Louis d'Arrest | lenticular galaxy |
| NGC 4426 | April 21, 1865 | Heinrich Louis d'Arrest | multiple star |
| NGC 4585 | April 21, 1865 | Heinrich Louis d'Arrest | spiral galaxy |
| NGC 4445 | April 24, 1865 | Heinrich Louis d'Arrest | spiral galaxy |
| NGC 4084 | April 26, 1865 | Heinrich Louis d'Arrest | elliptical galaxy |
| NGC 3943 | April 27, 1865 | Heinrich Louis d'Arrest | spiral galaxy |
| NGC 3820 | April 29, 1865 | Heinrich Louis d'Arrest | spiral galaxy |
| NGC 528 | August 22, 1865 | Heinrich Louis d'Arrest | lenticular galaxy |
| NGC 789 | August 24, 1865 | Heinrich Louis d'Arrest | spiral galaxy |
| NGC 688 | September 16, 1865 | Heinrich Louis d'Arrest | barred spiral galaxy |
| NGC 753 | September 16, 1865 | Heinrich Louis d'Arrest | spiral galaxy |
| NGC 843 | September 16, 1865 | Heinrich Louis d'Arrest | asterism |