Oliver Gillberg (born 18 October 1996) is a Swedish professional golfer and Challenge Tour player. He won the Swedish Matchplay Championship twice, in 2019 and 2024.

Gillberg got his first golf club when he turned one, and was coached by his father, a teaching pro at Askersund Golf Club. He won several titles on the junior Skandia Tour and finished 4th at Swedish Junior Strokeplay Championship in 2015, and 4th again in 2016, three strokes behind winner Jesper Svensson.

In 2016, he joined the Nordic Golf League while still an amateur, where he recorded six top-12 finishes, including a runner-up at the Finnish Open at Åland Golf Club. In 2017, he finished 4th individually at the European Nations Cup – Copa Sotogrande.

In 2018, Gillberg won the South African Stroke Play Championship at Pecanwood Golf Estate, a stroke ahead of Matt Saulez and two ahead of Wilco Nienaber.

He appeared for Sweden at the 2018 Eisenhower Trophy in Ireland, and at the 2018 European Amateur Team Championship in Germany alongside David Nyfjäll, Pontus Nyholm, Jesper Svensson, Tim Widing and Ludvig Åberg, where they led the strokeplay ahead of England but lost in the quarterfinal to eventual winners Finland.

Gillberg rose to a career-high of 7th in the World Amateur Golf Ranking, and topped the European Amateur Golf Ranking.

Gillberg turned professional in late 2018, and won twice on the Nordic Golf League in 2019, to finish 3rd in the 2019 Swedish Golf Tour Order of Merit.

He was runner-up at the 2023 Swedish PGA Championship, and won the Swedish Matchplay Championship twice, in 2019 at Österåker Golf Club and in 2024 at Rya Golf Club.