| 2021-06-05 | UFC Fight Night: Rozenstruik vs. Sakai | Heavyweight | Marcin Tybura def. Walt Harris | TKO (punches) | 1 | 4:06 |
| 2020-10-24 | UFC 254: Khabib vs. Gaethje | Heavyweight | Alexander Volkov def. Walt Harris | TKO (body kick and punches) | 2 | 1:15 |
| 2020-05-16 | UFC on ESPN: Overeem vs. Harris | Heavyweight | Alistair Overeem def. Walt Harris | TKO (punches) | 2 | 3:00 |
| 2019-07-20 | UFC on ESPN: dos Anjos vs. Edwards | Heavyweight | Walt Harris def. Aleksei Oleinik | KO (knee and punches) | 1 | 0:12 |
| 2019-05-04 | UFC Fight Night: Iaquinta vs. Cowboy | Heavyweight | Walt Harris def. Serghei Spivac | TKO (knees and punches) | 1 | 0:50 |
| 2018-12-29 | UFC 232: Jones vs. Gustafsson 2 | Heavyweight | Walt Harris vs. Andrei Arlovski | No Contest (overturned) | 3 | 5:00 |
| 2018-06-01 | UFC Fight Night: Rivera vs. Moraes | Heavyweight | Walt Harris def. Daniel Spitz | TKO (punches and elbows) | 2 | 4:59 |
| 2017-11-04 | UFC 217: Bisping vs. St-Pierre | Heavyweight | Mark Godbeer def. Walt Harris | DQ (illegal head kick) | 1 | 4:29 |
| 2017-10-07 | UFC 216: Ferguson vs. Lee | Heavyweight | Fabrício Werdum def. Walt Harris | Submission (armbar) | 1 | 1:05 |
| 2017-06-17 | UFC Fight Night: Holm vs. Correia | Heavyweight | Walt Harris def. Cyril Asker | TKO (punches and elbows) | 1 | 1:44 |
| 2017-01-15 | UFC Fight Night: Rodríguez vs. Penn | Heavyweight | Walt Harris def. Chase Sherman | KO (knee and punches) | 2 | 2:41 |
| 2016-10-01 | UFC Fight Night: Lineker vs. Dodson | Heavyweight | Shamil Abdurakhimov def. Walt Harris | Decision (split) (28–29, 29–28, 29–28) | 3 | 5:00 |
| 2016-04-23 | UFC 197: Jones vs. Saint Preux | Heavyweight | Walt Harris def. Cody East | TKO (punches) | 1 | 4:18 |
| 2014-11-08 | UFC Fight Night: Rockhold vs. Bisping | Heavyweight | Soa Palelei def. Walt Harris | TKO (punches) | 2 | 4:49 |
| 2014-01-25 | UFC on Fox: Henderson vs. Thomson | Heavyweight | Nikita Krylov def. Walt Harris | TKO (head kick and punches) | 1 | 0:25 |
| 2013-11-30 | The Ultimate Fighter: Team Rousey vs. Team Tate Finale | Heavyweight | Jared Rosholt def. Walt Harris | Decision (unanimous) (29–28, 29–28, 29–28) | 3 | 5:00 |