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 Bełchatów.

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.