Maciej Zajder (born 31 January 1988) is a Polish volleyball player. At the professional club level, he plays for the Polish team, Stal Nysa, PlusLiga.
Zajder is an alumnus of Skra Beà Âchatów. From 2011 to 2013, he was a player of AZS Politechnika Warszawska.
In 2013 he won, a silver medal of the 2013 Summer Universiade held in Kazan.