My definition of a Borg episode is an episode in which one or more Borg drones appear or a functional Borg ship is encountered. Things get complicated once Seven Of Nine joins Voyager because, essentially, every episode becomes a Borg episode. To solve this problem, I don't count her has a Borg drone appearance.

Show	Stardate	Title
	2153/03/01	Regeneration
	42761.3	Q™ Who
	43989.1	The Best of Both Worlds, Part I
	44001.4	The Best of Both Worlds, Part II
	45854.2	I, Borg
	46982.1	Descent, Part I
	47025.4	Descent, Part II
	50614.2	Unity
	50893.5	Star Trek VIII: First Contact
	50984.3	Scorpion, Part I
	51003.7	Scorpion, Part II
	5122?.?	The Raven
	5210?.?	Drone
	5258?.?	Dark Frontier, Part I
	5259?.?	Dark Frontier, Part II
	53049.2	Survival Instinct
	5362?.?	Collective
	5372?.?	Child’s Play
	5399?.?	Unimatrix Zero, Part I
	54014.4	Unimatrix Zero, Part II
	54973.4	Endgame