Firearms
Beretta M12
Several of the French Police outside of the Police HQ are armed with Beretta M12s.
Revolver
Several of the French policemen are armed with revolvers
Beretta 92fs
Bizu(William Abadie) is killed by Yuri the Trainer(Henry Czerny) with a Beretta 92FS with a laser sighting attachment.
Flashpaper Beretta 92fs
A Flashpaper Beretta 92fs is used in the flashback of Yuri shooting Bizu.
S&W Model 36
Inspector Clouseau's(Steve Martin's) firearm is a 5-shot Smith & Wesson Model 36 which for whatever reason he keeps in his handbag instead of on his person.
A Smith & Wesson Model 36 is also found in Clouseau's bag at the airport.
.22 Pistol
Agent 006(Clive Owen) uses some sort of .22 caliber pistol mocked up as a "sleeping" gun to take out the gas mask bandits.
NYPD sidearm
Some sort of handgun, possibly a Walther P99 is carried by NYPD cops.
Smith & Wesson Model 64
A Smith & Wesson Model 64 is found in Clouseau's bag at the airport.
Browning Hi-Power
A Browning Hi-Power is found in Clouseau's bag at the airport.
That does not look like a HP, the front part of the slide doesn't look like one. It looks like a SIG P210 or a Walther P88
Mk.II Hand Grenade
A Mk 2 hand grenade is found in Clouseau's bag at the airport.
M16A1 w/ A2 handguards
The soldiers who apprehend Clouseau at the airport are armed with M16A1's with A2 handguards.
Unknown
Mossberg 500 "Persuader"
A Mossberg 500 with a pistol grip is carried by a Gendarme member escorting Inspector Clouseau to the police HQ from the airport.
Glock 17
An early model Glock 17 is used by a guard at the presidential palace.
Crossbow
Yuri the trainer(Henry Czerny) uses a Crossbow to try and assassinate Xania(Beyoncé Knowles).
Walther PPK
Ponton(Jean Reno) carries a Walther PPK.
Miscellaneous