The Brazilian travelled forward for a late corner and subsequently headed home Trent Alexander-Arnold's delivery in stunning fashion to send Jurgen Klopp’s men fifth in the Premier League and just one point behind fourth-place Chelsea with only two matches left to play this term.
More than just keeping his team firmly in the hunt for Champions League qualification with his memorable goal at The Hawthorns, Alisson also became the first goalkeeper ever to net for Liverpool in their entire 129-year history and just the sixth overall to score in a Premier League match.
Here’s a look at the other custodians to have previously achieved the feat...
Schmeichel became the first goalkeeper to score in a Premier League game in 2001 in a 3-2 defeat for Aston Villa at Everton. The former Manchester United star volleyed home Villa's second goal at the back post from Steve Staunton's late corner in the 90th minute, but it was too late to affect the outcome.
Schmeichel scored an impressive 13 goals in his career - his most famous being Manchester United's equaliser in a Uefa Cup tie against Rotor Volgograd in 1996.
In February 2004, Friedel scored a goal for Blackburn from open play in the 90th minute of his side's 3-2 defeat at Charlton. The American's effort also came from a corner and levelled the game up at 2-2, but there was still time for Claus Jensen to snatch a last-gasp winner for Charlton.
Robinson scored in the closing stages of Tottenham's 3-1 win over Watford in 2007 with a free-kick 75 yards from goal. The ball bounced in front of Hornets goalkeeper Ben Foster and went over his head and into the net. Robinson also headed a last-minute equaliser for Leeds against Swindon in the Carling Cup in 2003.
Howard struck with a freakish 101-yard clearance for Everton during their 2-1 defeat to Bolton in 2012. The American punted the ball upfield from his own penalty area and looked on as his wind-assisted effort bounced once over opposite number Adam Bogdan at the other end. Howard said later he had refused to celebrate out of respect for his fellow goalkeeper.
Begovic scored for Stoke after just 13 seconds of their match against Southampton in 2013. With a strong wind blowing from behind his goal Begovic launched a long punt forward, defender Dejan Lovren allowed the ball to bounce and it picked up pace before ballooning over Artur Boruc and into the net.
Additional reporting by the Press Association.