On 5 September 2020, Button transferred to recently promoted Premier League side [[West Bromwich Albion F.C.|West Bromwich Albion]] for an undisclosed fee.<ref>{{Cite press release|title=Button sews up move|url=https://www.brightonandhovealbion.com/news/1810075/button-sews-up-move|date=5 September 2020|publisher=Brighton & Hove Albion|access-date=5 September 2020}}</ref> Button made his debut on 16 September in which he kept a clean sheet in the 3–0 [[2020-21 EFL Cup|EFL Cup]] victory over [[Harrogate Town F.C.|Harrogate Town]] at [[The Hawthorns]].<ref>{{cite web|url=https://www.bbc.co.uk/sport/football/54072159|title= West Bromwich 3–0 Harrogate Town: Baggies reach third round of Carabao Cup |publisher=BBC Sport |date=16 September 2020|access-date=27 October 2020}}</ref><ref>{{Cite press release|title=Albion sew up Button deal|url=https://www.wba.co.uk/news/albion-sew-button-deal|date=5 September 2020|publisher=West Bromwich Albion|access-date=5 September 2020}}</ref> He played in their next league cup game six days later where West Brom lost on penalties at home to Button's former club Brentford after a 3–3 draw at full time.<ref>{{cite web|url=https://www.bbc.co.uk/sport/football/54193050|title= Brentford beat West Brom on penalties in third round |publisher=BBC Sport |date=22 September 2020|access-date=27 September 2020}}</ref> Button's next appearance came in the [[2020–21 FA Cup|FA Cup]], losing in another penalty shootout, this time away at [[Blackpool F.C.|Blackpool]] on 9 January 2021.<ref>{{cite web|url=https://www.bbc.co.uk/sport/football/55574422|title=Blackpool 2–2 West Bromwich Albion (3–2 pens): Sam Allardyce's Baggies suffer FA Cup shock |publisher=BBC Sport |date=9 January 2021|access-date=9 January 2021}}</ref> On the same day it was revealed that West Brom had signed former [[Preston North End]] and [[Liverpool F.C.|Liverpool]] veteran keeper [[Andy Lonergan]].<ref>{{cite web|url=https://www.bbc.co.uk/sport/football/55600187|title=Andy Lonergan: West Brom sign veteran goalkeeper on short–term deal |publisher=BBC Sport |date=9 January 2021|access-date=9 January 2021}}</ref> One week later Button made his league debut for the club, playing in the 3–2 away win over [[Wolverhampton Wanderers]], in place of [[Sam Johnstone]] who was out with [[COVID-19]].<ref>{{cite web|url=https://www.bbc.co.uk/sport/live/football/55324431|title=Wolves 2–3 West Brom |publisher=BBC Sport |date=16 January 2021|access-date=16 January 2021}}</ref>
After relegation from the Premier League in the previous season, West Brom opened the [[2021–22 EFL Championship|Championship season]] on 6 August with an away fixture against Bournemouth where Button was preferred over Sam Johnstone playing in the 2–2 draw.<ref>{{cite web|url=https://www.bbc.co.uk/sport/football/58021521|title=Bournemouth 2-2 West Bromwich Albion: Point each for new bosses Parker and Ismael |publisher=BBC Sport |date=6 August 2021|access-date=8 August 2021}}</ref> After Sam Johnstone was sent off after the final whistle in the 1–1 home draw against [[Cardiff City F.C.|Cardiff City]] on 2 January 2022, Button won some game time and played in several consecutive matches. This included a 2–1 home loss to his previous club Brighton in the [[2021-22 FA Cup#third round|FA Cup third round]] on 8 January. Button kept his place in goal after Johnstone's suspension was over with head coach [[Valerien Ismael]] keeping the first choice keeper out due to an internal issue.<ref>{{cite web|url=https://www.bbc.co.uk/sport/football/59792506|title=West Bromwich Albion 1-1 Cardiff City: Three red cards in draw |publisher=BBC Sport |date=2 January 2022|access-date=29 January 2022}}</ref><ref>{{cite web|url=https://www.bbc.co.uk/sport/football/59911369|title=West Bromwich Albion 1-2 Brighton & Hove Albion: Neal Maupay hits extra-time winner |website=BBC Sport|date=8 January 2022|access-date=29 January 2022}}</ref><ref>{{cite web|url=https://www.bbc.co.uk/sport/football/59918722|title=Queens Park Rangers 1-0 West Bromwich Albion: Charlie Austin nets winner against old club |publisher=BBC Sport |date=15 January 2022|access-date=29 January 2022}}</ref><ref>{{cite web|url=https://www.bbc.co.uk/sport/football/60005717|title=West Bromwich Albion 3-0 Peterborough United: Valerien Ismael's side end poor run |publisher=BBC Sport |date=22 January 2022|access-date=29 January 2022}}</ref><ref>{{cite web|url=https://www.bbc.co.uk/sport/football/59764901|title=West Bromwich Albion 0-2 Preston North End: Emil Ris Jakobsen and Cameron Archer score in Lilywhites' win |publisher=BBC Sport |date=26 January 2022|access-date=29 January 2022}}</ref><ref>{{cite web|url=https://www.bbc.co.uk/sport/football/60149278|title=Sam Johnstone: West Brom and England goalkeeper left out over 'internal issue' |publisher=BBC Sport |date=27 January 2022|access-date=29 January 2022}}</ref><ref>{{cite web|url=https://www.bbc.co.uk/sport/football/60093110|title=Millwall 2-0 West Bromwich Albion: Defeat increases pressure on Baggies boss Valerien Ismael |publisher=BBC Sport |date=29 January 2022|access-date=29 January 2022}}</ref> New manager [[Steve Bruce]] admitted in April that it was likely that Sam Johnstone would leave on the expiry of his contract, with Button playing West Brom's five remaining matches of the season with Johnstone absent from the squad. In the 4–0 home victory over already relegated and his former loan club [[Barnsley F.C.|Barnsley]] in the last game of the season, Button assisted [[Adam Reach]]'s goal with a long range pass with West Brom sealing 10th place.<ref>{{Cite web|title=Steve Bruce appointed Albion Manager {{!}} West Bromwich Albion|url=https://www.wba.co.uk/news/steve-bruce-appointed-albion-manager|date=3 February 2022|access-date=7 May 2022|website=www.wba.co.uk|language=en}}</ref><ref>{{cite web|url=https://www.birminghammail.co.uk/sport/football/football-news/steve-bruce-makes-sam-johnstone-23663923|title=Steve Bruce makes Sam Johnstone admission as West Brom handed double transfer verdict - Birmingham Live|publisher=Birmingham Live|date=12 April 2022|access-date=7 May 2022}}</ref><ref>{{cite web|url=https://www.bbc.co.uk/sport/football/61033694|title=West Bromwich Albion 2-1 Blackpool: Karlan Grant scores late Baggies winner |publisher=BBC Sport|date=15 April 2022|access-date=7 May 2022}}</ref><ref>{{cite web|url=https://www.bbc.co.uk/sport/football/61063056|title=Nottingham Forest 4-0 West Bromwich Albion: Steve Cooper's Reds win to delay Fulham promotion |publisher=BBC Sport|date=18 April 2022|access-date=7 May 2022}}</ref><ref>{{cite web|url=https://www.bbc.co.uk/sport/football/61124792|title=West Bromwich Albion 0-0 Coventry City - Midlands derby ends goalless at the Hawthorns |publisher=BBC Sport|date=23 April 2022|access-date=7 May 2022}}</ref><ref>{{cite web|url=https://www.bbc.co.uk/sport/football/61198205|title=Reading 0-1 West Bromwich Albion: Karlan Grant's winner snatches late victory for Baggies |publisher=BBC Sport|date=30 April 2022|access-date=7 May 2022}}</ref><ref>{{cite web|url=https://www.bbc.co.uk/sport/football/61281038|title=West Bromwich Albion 4-0 Barnsley: Karlan Grant scores double as Baggies thrash Tykes |publisher=BBC Sport|date=7 May 2022|access-date=7 May 2022}}</ref>
