The Belgian international defender has been in fine form and capped the month with a goal and assist in last weekend's key win at Swansea.
Jan, who has played 41 of our 46 games in all competitions this season, also scored twice at Anfield as we led against Liverpool, only to lose 3-2.
Away from the Premier League, Jan scored in our 3-0 first leg win against Inter Milan in the Europa League on March 7 and kept two clean sheets as Belgium won back-to-back World Cup qualifiers against Macedonia to top Group A.
It's our fourth Barclays award of the campaign. Andre Villas-Boas has won Manager of the Month in December and February, while Gareth picked up Barclays Player of the Month for February.
We'll have Jan's thoughts on the award soon...