The Manchester City striker is just the fourth player to win the award is his debut campaign in English football while Chelsea's Kerr has won the prize for the second season running.
Haaland received a record 82 per cent of the FWA vote ahead of Arsenal pair Bukayo Saka and Martin Odegaard.
The Norwegian marksman has scored an incredible 51 goals in all competitions - including a record 35 so far in the Premier League - as City look to win a historic treble.
Haaland said: "To win the Football Writers’ Award in my first season in English football is an honour. I try every single day to be the best I can be, and to be recognised like this means a lot to me.
"I have loved my time at City so far – my teammates are incredible, and they provide me with the chances to score goals. I want to thank all of them, because I could not have won this award without them. Thank you to everyone who voted for me."
Kerr has scored 26 goals in 34 appearances for Chelsea as they chase a Women's Super League and FA Cup double. The Blues are a point behind Manchester United in the WSL and will take on the same opposition at Wembley in the FA Cup final on Sunday (14.05.23).
Haaland and Kerr will receive their awards at the FWA Footballer of the Year 75th Anniversary dinner on 25 May.