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

The Joker (Jack Nicholson) uses a Smith & Wesson Model 15-3 with a custom 21 inch barrel to shoot down the Batwing.

The Joker's Smith & Wesson Model 15-3 in his waistband

The Joker holding his 21 inch barrel Smith & Wesson Model 15-3

The Joker aiming his Smith & Wesson Model 15-3 at the Batwing

Smith & Wesson Model 1

The Joker (Jack Nicholson) uses a Smith & Wesson Model 1 when he confronts Bruce Wayne. A metal plate Bruce hid under his shirt stops the bullet.

The Joker aims his Smith and Wesson Model 1 at Bruce Wayne

The Joker holds his Smith & Wesson Model 1 after shooting Bruce

Unknown Revolvers

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.

I see Model 19s, Colt New Services, and Webleys. Maybe even more. - Gunmaster45

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

M1928 Thompson

The Joker's goon use M1928 Thompson Submachine Guns multiple times throughout the movie.

M1928 Thompson with 50 round drum magazine - .45 ACP

Goons holdign their M1928 Thompsons on the mob

Unknown Double Barrel Shotgun/Flare Gun

The Joker uses this weapon to shoot his TV, then proceeds to hand it to Bob.

The Joker shooting his TV

The Joker handing the gun to Bob

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.