The Nationals released right-handers Joe Bisenius and Tim Wood and outfielder Jonathan Van Every, according to MLB.com's Bill Ladson (on Twitter).
Bisenius, 28, appeared in five games for the Nationals last year in his first MLB action since 2007. He spent most of the season in the minors, where he posted a 3.05 ERA with 10.8 K/9 and 3.8 BB/9 in 38 1/3 innings across three levels.
Wood logged 27 2/3 innings for the Marlins last year, posting a 5.53 ERA. Also 28, he has a 4.72 ERA with 7.4 K/9 and 3.8 BB/9 over the course of his eight-year minor league career.
Van Every played all three outfield positions for the Red Sox in 2010, the third consecutive season in which he had a brief stint in the majors. Red Sox manager Terry Francona has called on the 31-year-old to pitch in both of the past two seasons and Van Every has also pitched in a minor league game. He has a .254/.356/.477 line in a decade's worth of minor league plate appearances.