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Memory Alpha
Real World article
(written from a Production point of view)

Instances on Star Trek: Deep Space Nine of the regular cast listed in the opening credits not appearing in the episode.

Do not list episodes where the cast member was not part of the regular cast.

Avery Brooks

Nana Visitor

Rene Auberjonois

Michael Dorn

Michael Dorn was not a cast member for seasons 1-3.

Terry Farrell

Terry Farrell was not a cast member for season 7.

Alexander Siddig

Colm Meaney

Nicole de Boer

Nicole de Boer was not a cast member for seasons 1-6.

Armin Shimerman

Cirroc Lofton

Cirroc Lofton was the only regular cast member in any Star Trek series to date to be absent for more episodes than he appeared.