Seny Timothy Dieng (born 23 November 1994) is a professional footballer who plays as a goalkeeper for EFL Championship club Middlesbrough.

[3] In November 2012, Dieng made his debut in adult football at the age of 17, for FC Grenchen whilst on loan from Grasshoppers.

[8] On 2 December 2017, while playing for Whitehawk (in National League South) on loan, Dieng scored a goal in the 91st minute of a game against Chippenham Town.

[10] Dieng spent the first half of the 2018–19 season, on loan at Stevenage,[11] making his debut on 14 August 2018 in an EFL Cup match against Norwich City.

[13] On 26 July 2019, having still not made a senior appearance for QPR, Dieng went out on loan again, this time joining League One side Doncaster Rovers until 4 January 2020.

[19] On 17 April 2021, Dieng received a red card on the 58th minute after a late challenge on Duncan Watmore in a 2–1 away win at Middlesbrough.

He kept a clean sheet in each of those appearances, actions proving to be vital given Senegal only managed 1 goal throughout the entirety of the group stages before going on to win the tournament, beating Egypt on penalties.