| 2026-08-15 | UFC 330: Makhachev vs. Machado Garry | Women’s Strawweight | Mackenzie Dern def. Gillian Robertson title | Decision (unanimous) (49–46, 49–46, 48–47) | 5 | 5:00 |
| 2026-03-14 | UFC Fight Night: Emmett vs. Vallejos | Women’s Strawweight | Gillian Robertson def. Amanda Lemos | Decision (unanimous) (29–28, 29–28, 29–28) | 3 | 5:00 |
| 2025-05-03 | UFC on ESPN: Sandhagen vs. Figueiredo | Women’s Strawweight | Gillian Robertson def. Marina Rodriguez | TKO (punches) | 2 | 2:07 |
| 2024-11-09 | UFC Fight Night: Magny vs. Prates | Women’s Strawweight | Gillian Robertson def. Luana Pinheiro | Decision (unanimous) (29–27, 29–28, 29–28) | 3 | 5:00 |
| 2024-06-29 | UFC 303: Pereira vs. Procházka 2 | Women’s Strawweight | Gillian Robertson def. Michelle Waterson | Decision (unanimous) (30–27, 30–27, 30–26) | 3 | 5:00 |
| 2024-01-20 | UFC 297: Strickland vs. du Plessis | Women’s Strawweight | Gillian Robertson def. Polyana Viana | TKO (punches) | 2 | 3:12 |
| 2023-06-24 | UFC on ABC: Emmett vs. Topuria | Women’s Strawweight | Tabatha Ricci def. Gillian Robertson | Decision (unanimous) (29–28, 29–28, 30–27) | 3 | 5:00 |
| 2023-04-15 | UFC on ESPN: Holloway vs. Allen | Women’s Strawweight | Gillian Robertson def. Piera Rodríguez | Submission (armbar) | 2 | 4:21 |
| 2022-09-17 | UFC Fight Night: Sandhagen vs. Song | Women’s Flyweight | Gillian Robertson def. Mariya Agapova | Technical Submission (rear-naked choke) | 2 | 2:19 |
| 2022-03-12 | UFC Fight Night: Santos vs. Ankalaev | Women’s Flyweight | JJ Aldrich def. Gillian Robertson | Decision (unanimous) (30–27, 30–27, 30–27) | 3 | 5:00 |
| 2021-12-11 | UFC 269: Oliveira vs. Poirier | Catchweight | Gillian Robertson def. Priscila Cachoeira | Submission (rear-naked choke) | 1 | 4:59 |
| 2021-03-27 | UFC 260: Miocic vs. Ngannou 2 | Women’s Flyweight | Miranda Maverick def. Gillian Robertson | Decision (unanimous) (30–27, 30–27, 29–28) | 3 | 5:00 |
| 2020-12-19 | UFC Fight Night: Thompson vs. Neal | Women’s Flyweight | Taila Santos def. Gillian Robertson | Decision (unanimous) (30–26, 30–26, 29–28) | 3 | 5:00 |
| 2020-10-18 | UFC Fight Night: Ortega vs. The Korean Zombie | Women’s Flyweight | Gillian Robertson def. Poliana Botelho | Decision (unanimous) (29–28, 29–27, 29–27) | 3 | 5:00 |
| 2020-06-20 | UFC on ESPN: Blaydes vs. Volkov | Women’s Flyweight | Gillian Robertson def. Cortney Casey | Submission (rear-naked choke) | 3 | 4:32 |
| 2019-10-18 | UFC on ESPN: Reyes vs. Weidman | Women’s Flyweight | Maycee Barber def. Gillian Robertson | TKO (punches) | 1 | 3:04 |
| 2019-07-27 | UFC 240: Holloway vs. Edgar | Women’s Flyweight | Gillian Robertson def. Sarah Frota | TKO (elbows) | 2 | 4:13 |
| 2019-02-23 | UFC Fight Night: Błachowicz vs. Santos | Women’s Flyweight | Gillian Robertson def. Veronica Macedo | Submission (rear-naked choke) | 2 | 3:27 |
| 2018-09-22 | UFC Fight Night: Santos vs. Anders | Women’s Flyweight | Mayra Bueno Silva def. Gillian Robertson | Submission (armbar) | 1 | 4:55 |
| 2018-05-27 | UFC Fight Night: Thompson vs. Till | Catchweight | Gillian Robertson def. Molly McCann | Technical Submission (rear-naked choke) | 2 | 2:05 |
| 2017-12-01 | The Ultimate Fighter: A New World Champion Finale | Women’s Flyweight | Gillian Robertson def. Emily Whitmire | Submission (armbar) | 1 | 2:12 |