Batman (1989)

The following guns were used in the film Batman:

Colt M1911A1

Bob (Tracey Walter) uses a Colt M1911A1 throughout the movie on several occasions. A random goon also uses one later in the movie.

Colt M1911A1 Pistol - .45 ACP

Bob holding his Colt M1911A1

Bob holding his Colt M1911A1 on Commissioner James Gordon

Bob pointing his Colt M1911A1 at Bruce Wayne

A goon shooting at the Batmobile with a Colt M1911A1

A goon holds what appears to be a Colt M1911A1 pistol on Batman

Another shot of the goon's Colt M1911A1

Smith & Wesson 15-3

.38spl with custom 21 inch barrel. The pistol he pulls out of his pants to shoot the Batwing plane down.

Smith & Wesson Model 1

Jack Napier (Jack Nicholson) uses this as his sidearm throughout the movie. He continues to use this as the Joker.

I only remember him using it in the scene when he shoots Bruce, the bullet stopped only by a metal tray he hid under his shirt. Despite being a little .22 pistol, the gun made the typical movie gunshot.

Colt New Service

Jack Napier/The Joker (Jack Nicholson) uses a Colt New Service throughout most of the film including the BANG flag gun at the film's climax. The only exception is one small edit when he pulls back the hammer is the Axis Chemical plant. A different pistol was used for this one shot. There are a great many revolvers used in this movie, I will just post all revolver screens in this section, as I am no good at identifying them. Maybe someone else can.

A thug at the beginning of the movie holds a revolver on a woman

The same thug holding his revolver

Lieutenant Eckhardt pointing his revolver at Jack Napier

A police officer with his revolver

Police officers with their revolvers at the ready

Jack Napier holding his revolver while on the catwalk

Jack Napier cocking his revolver

Jack's revolver laying on the catwalk after Batman knocks it out of his hands

Jack holding his revolver after retrieving it

Jack aiming his revolver

The mob boss going for his hidden revolver

The Joker's mime goons wield revolvers when they pick him up

The Joker's goons shoot at the Batmobile with revolvers

The same goon holding his revolver

Batman kicks the revolver out of the goon's hand

Young Jack Napier shooting Bruce's parents with a revolver in a flashback

Another shot of Young Jack Napier's revolver

The Joker gives his revolver to one of his goons

The Joker shoots himself with this revolver, only to reveal it was a fake "BANG" flag gun

Browning M1919

The guns that pop out of the Batmobile's fenders are two Browning M1919's. Seen toward the end of the movie as the Batmobile is entering the chemical plant.

GE M134 Minigun

Pops out of the Batwing plane, but is only seen for a few seconds.