| Isileli Tuungafasi | |
| Birth Date: | 10 January 1995 |
| Birth Place: | Nukuʻalofa, Tonga |
| Height: | 1850NaN0 |
| Weight: | 1160NaN0 |
| School: | Māngere College |
| Relatives: | Mofuike Tuungafasi (father) Ofa Tuungafasi (brother) |
| Position: | Prop |
| Years1: | 2015–2017 |
| Apps1: | 19 |
| Points1: | 0 |
| Years2: | 2018–2019, 2024– |
| Apps2: | 22 |
| Points2: | 0 |
| Years3: | 2019–2021 |
| Clubs3: | Crusaders |
| Apps3: | 12 |
| Points3: | 0 |
| Years4: | 2020–2022 |
| Apps4: | 22 |
| Points4: | 0 |
| Years5: | 2022– |
| Apps5: | 7 |
| Points5: | 0 |
| Years6: | 2023 |
| Apps6: | 3 |
| Points6: | 0 |
| Repyears1: | 2015 |
| Repteam1: | New Zealand U20 |
| Repcaps1: | 7 |
| Reppoints1: | 0 |
| Clubupdate: | 10 August 2024 |
| Repupdate: | 10 August 2024 |
Isileli J. Tuungafasi (born 10 January 1995) is a Tongan born New Zealand rugby union player, who currently plays for in the Bunnings NPC.[1] He previously played for in Super Rugby.[2] [3] His playing position is prop.[4] He is the brother of Ofa Tuungafasi, another rugby union player.
Tuungafasi started his career playing for playing 19 games across 3 seasons before he moved north to where he played another 21 games. He was a late addition to the Crusaders squad for round 6 of the 2019 Super Rugby season.[5] In 2020 he was named in the squad. He moved Mitre 10 Cup teams again for the 2020 Mitre 10 Cup, this time to making his debut for the Mako in Round 1 against . The Mako went on to win the premiership title in 2020 for the second time in a row. Tuungafasi played only 2 games for the Crusaders during the 2021 season due to strong performances by fellow props Joe Moody, George Bower and Tamaiti Williams. In October 2021 Tuungafasi signed with for the 2022 Super Rugby Pacific season. He played a crucial role in the number 1 jersey for Tasman during the 2021 Bunnings NPC as the Mako made the final before losing 23–20 to . After being signed by the side in 2021 Tu'ungafasi finally made his debut for Moana Pasifika in Round 2 of the 2023 Super Rugby Pacific season against the .