Sebastian Árpád Mailat (born 12 December 1997) is a Romanian professional footballer who plays as a winger for Liga I club Sepsi OSK.

Mailat started out as a senior at his hometown side ACS Poli Timișoara in 2016, and moved to CFR Cluj the following year.

On 26 May 2016, Mailat made his professional debut in the Liga I and scored a long-range goal in a 2–3 loss to CSM Studențesc Iași.

[6] On 1 August 2018, Mailat registered his European debut by coming on for Ciprian Deac in the 43rd minute of a UEFA Champions League second qualifying round game with Malmö FF (1–1 home draw, 1–2 loss on aggregate).

[12] He made his debut in a 1–0 win against Sepsi OSK on the 20th that month, and scored his only goal of the season in a 5–0 defeat of his former team Gaz Metan Mediaș on 14 March.