The Englishman saw off a stern competition from Kevin De Bruyne and fellow countryman Marcus Rashford, as well as team-mates Virgil van Dijk, Alisson Becker and Sadio Mane, to claim the laurel.
De Bruyne came second in the voting with Rashford third, while Alisson and Van Dijk rounded out the top five.
Henderson played 30 games, scoring four times and provided five assists in the Premier League so far this season.
Reflecting on winning the oldest individual award in English football, the former Sunderland man said: “I’d like to say how appreciative I am of the support of those who voted for me and the Football Writers’ Association in general.”
“You only have to look at the past winners of it, a number of whom I’ve been blessed to play with here at Liverpool, like Stevie (Gerrard), Luis (Suarez) and Mo (Salah) to know how prestigious it is.”
“As grateful as I am I don’t feel like I can accept this on my own. I don’t feel like anything I’ve achieved this season or in fact during my whole career has been done on my own.”
“I owe a lot to so many different people, but none more so than my current team-mates, who have just been incredible and deserve this every bit as much as I do.”
“We’ve only achieved what we’ve achieved because every single member of our squad has been brilliant. Not just in matches, not just in producing the moments that make the headlines and the back pages, but every day in training.”
“The players who’ve started the most games for us this season have been as good as they have been because of our culture and our environment at Melwood.”
“No one individual is responsible for that – it’s a collective effort and that’s how I view accepting this honour.”
“I accept it on behalf of this whole squad, because without them I’m not in a position to be receiving this honour."
