Here's a couple of my favorite fight scenes from the show. Placed in chronological order.
Buffy vs Luke in The Harvest;
Buffy vs the Master in Prophecy Girl;
The Gang vs Machida-worshipping frat boys in Reptile Boy;
Xander vs Larry the Pirate in Halloween;
Kendra vs Angel, Kendra vs Buffy in What's My Line, Part 1;
Buffy vs Angel at the mall in Innocence;
Giles vs Angel, Buffy vs Angel at the factory in Passion;
Library fight scene (the Gang vs Dru & the Boyz) at the end of Becoming, Part 1;
Buffy vs Angel, Spike vs Dru in Becoming, Part 2;
Buffy, Angel & Spike vs "a committee" in Lovers Walk;
Buffy, Angel, Giles & Xander vs Vamp!Willow's boys, Willow vs Anya in Doppelgangland;
Buffy & Angel fighting with Mayor's goons for the Box of Gavrok in Choices;
Buffy vs Faith in Graduation Day, Part 1;
Scooby Gang vs Sunday's Gang in The Freshman;
Buffy vs Kathy in Living Conditions;
The Gang vs Hus' warriors in Pangs;
Buffy vs Faith at Revello Drive in This Year's Girl;
Buffy vs the knights in Spiral;
Scooby Gang vs Hellions in Bargaining, Part 2;
Dawn vs Lori in Him;
The Gang vs the Bringers in Never Leave Me.
Did I miss something remarkable/important? What are your favorite fight scenes throughout the series?