The Reds won the Premier League title with seven games to spare, ending a 30-year wait for their 19th top-flight championship. Playing arguably the best football of his career, England midfielder Henderson was influential in leading the side in a dominant campaign.
The FWA revealed Henderson, who has been out with a knee injury since early July, secured more than a quarter of the votes.
Team-mates Virgil van Dijk and Sadio Mane were in contention, along with Manchester City’s Kevin De Bruyne and Manchester United’s Marcus Rashford. Liverpool pair Alisson and Trent Alexander-Arnold also had votes cast in their favour. Henderson 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.
“But 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.