The England man was in fine form for the Reds over March.
The England man won 41.6% of the vote to top the voting, finishing ahead of Norwich City defender Timm Klose and Tottenham Hotspur star Harry Kane.
He had enjoyed a fine month as his side won two of their three games, with him playing a big role in both victories.
It has arguably been one of his best months at the club since arriving from Southampton at the beginning of last season.
He had struggled to impress under Brendan Rodgers, but has found his feet since Jurgen Klopp took charge.
His form clearly did not go unnoticed by England manager Roy Hodgson either as he was named in England’s squad for the friendlies with Germany and the Netherlands.
And while praising his contributions to Klopp’s team, some fans were pointing out he should now be guaranteed a place in the Three Lions first team for Euro 2016 also.
Here are some of the reactions after it was announced Lallana had won the award.
Adam Lallana winning PFA player of the month. Ridiculous to even entertain the idea of him leaving this summer..— sam. (@SamAlexWarren) April 1, 2016
Made up to see Lallana finally showing the form he was in at Southamton https://t.co/E8J86ySoFK— Tom Howden (@Howden10) April 1, 2016
Anyone who thinks that Lallana isn't a guaranteed starter for England hasn't been paying attention. Nailed on and rightly so.— Carl (@CarlMason79) April 1, 2016
Lallana is a joke has to start at the euros IMO— BV✌️ (@Billy23Wand) April 1, 2016