The popular stopper has again been an ever-present in the Premier League this season, recording 11 clean sheets and making 137 saves – the most of any 'keeper in the top flight by a comfortable distance.
Dúbravka has played 88 times for Newcastle following his arrival - initially on loan - from Sparta Prague in 2018.
Since making his debut in a man-of-the-match display against Manchester United two weeks after joining, the Slovakian hasn't missed a game for the Magpies in the Premier League.
"It is a big honour and privilege, because obviously I know the history and what kind of players play for this massive club and achieve this kind of trophy, so I couldn't be more happy and more delighted," Dúbravka told UNITED, the club's official matchday programme.
"It's a big thing for me. It's always nice to have this kind of memory, so really I'm so happy.
"I'm pleased that I could be on the pitch in every game, that I was fit and I was able to be there, trying to help my teammates, and I really hope that we can achieve in the next season a higher place in the league, because I think we have the potential. That's the plan."
The 31-year-old takes over the accolade from Salomón Rondón, and becomes the sixth different 'keeper to win the award since its inception in 1975/76 - following in the footsteps of the likes of Shay Given, Tim Krul and Rob Elliot.
The full list of winners is:
1975/76 Alan Gowling 1976/77 Micky Burns 1977/78 Irving Nattrass 1978/79 Peter Withe 1979/80 Alan Shoulder 1980/81 Kevin Carr 1981/82 Mick Martin 1982/83 Kevin Keegan 1983/84 Kevin Keegan 1984/85 Peter Beardsley 1985/86 Peter Beardsley 1986/87 Paul Goddard 1987/88 Paul Gascoigne 1988/89 John Hendrie 1989/90 Mick Quinn 1990/91 John Burridge 1991/92 Gavin Peacock 1992/93 Lee Clark 1993/94 Andy Cole 1994/95 Barry Venison 1995/96 Darren Peacock 1996/97 Steve Watson 1997/98 David Batty 1998/99 Alan Shearer 1999/00 Alan Shearer 2000/01 Shay Given 2001/02 Nobby Solano 2002/03 Alan Shearer 2003/04 Olivier Bernard 2004/05 Shay Given 2005/06 Shay Given 2006/07 Nicky Butt 2007/08 Habib Beye 2008/09 Sébastien Bassong 2009/10 José Enrique 2010/11 Fabricio Coloccini 2011/12 Tim Krul 2012/13 Davide Santon 2013/14 Mike Williamson 2014/15 Daryl Janmaat 2015/16 Rob Elliot 2016/17 Ciaran Clark 2017/18 Jamaal Lascelles 2018/19 Salomón Rondón 2019/20 Martin Dúbravka
