The purpose of ninjutsu is to enable ninja to perform their duties efficiently, primarily intelligence gathering and taking down enemies. Ninjutsu particularly aids ninja with stealth operations, as several techniques focus on making discreet escapes and swiftly incapacitating enemies a practitioner may encounter.
Many ninja use weapons, with shuriken being the most common. Others have been seen using swords and ropes.
Ninpo: Enton no Jutsu (忍法 ,Ninpō: ?, literally meaning "Ninja Art: Hell's Lute"): Used by an unnamed member of the Orochi Oniwabanshu. According to Roronoa Zoro, it is just firing a gun hidden inside the ninja Lute.
Ninpo: Enton no Jutsu (忍法 煙遁の術,Ninpō: Enton no Jutsu?, literally meaning "Ninja Art: Smoke Escape Technique"): Raizo throws a smoke ball into the ground and quickly moves to a new location while being obscured by the smokescreen.
Ninpo: Bunshin no Jutsu (忍法 分身の術,Ninpō: Bunshin no Jutsu?, literally meaning "Ninja Art: Clone Technique"): Multiple copies of Raizo are seen at once in various places. It is unknown whether he can actually make clones of himself or simply create speed-based illusions.
Ninpo: Daisuki no Jutsu (忍法 大好きの術,Ninpō: Daisuki no Jutsu?, literally meaning "Ninja Art: Loveable Technique"): Raizo leaps into the air and offers a hug.
Ninpo: Kawarimi no Jutsu (忍法 変わり身の術,Ninpō: Kawarimi no Jutsu?, literally meaning "Ninja Art: Body Replacement Technique"): Raizo replaces his body with a large log and reappears somewhere else, allowing him to escape an attack.
Ninpo: Odako (忍法 大凧,Ninpō: Ōdako?, literally meaning "Ninja Art: Big Kite"): Shinobu uses a large kite to evade pursuers through the air. It is large and durable enough to carry at least one additional person with Shinobu. It was first used to escape a home of an individual on whom Shinobu and Nami were spying.
Ninpo: Kintama-Tsubushi (忍法 金玉潰し,Ninpō: Kintama-Tsubushi?, literally meaning "Ninja Art: Ball-Crusher"): Shinobu throws an item which ricochets to hit her opponent's groin. It was first used against Hanzo of the Orochi Oniwabanshu.
Ninpo: Kanashibari no Jutsu (忍法 金縛りの術,Ninpō: Kanashibari no Jutsu?, literally meaning "Ninja Art: Paralysis Technique"): Shinobu uses her technique to paralyze her opponent. It was first used against Hanzo, but due to the previous usage of Ball Buster, it was questioned by Nami if that was an actual technique.
When Robin used one of her Hana Hana no Mi abilities before Kin'emon, he associated it with "Ninjutsu". Recently, so did the Orochi Oniwabanshu when they tried to attack 'her' and it was revealed to actually be one of her clones (but they also thought it might be "Sorcery").