美国海军三栖特种部队（英文：United States Navy Sea, Air and Land Teams，缩写SEALs），一般称作海豹部队，是直属美国海军的一支特种部队，亦是世界知名的特种三栖部队，主要任务包括：非常规战争、国内外防御、直接行动、反恐怖主义行动、特殊侦查任务五项。要成为一个三栖特战队成员并不容易，甄选者必须得先通过基础水下爆破训练（Basic Underwater Demolition/SEAL，BUD/S）以及专业的三栖资格训练（SEAL Qualification Training，SQT），最后才能佩带予显示三栖特战队的佩章（佩章图示），这枚佩章已经不仅仅是代表整个三栖特战队，间接也成为广为容易辨识美国特战部队的佩章之一。三栖特战队为了与支持他们的单位相吻合，成员们须穿着战斗服的修改版本。在三栖特战队参与越南战争时期，穿着的是类似老虎斑纹的迷彩服，当队员们易服执行巡逻任务时，经常穿着与平民们一样的蓝色牛仔裤和珊瑚蓝高筒帆布鞋。
成员双眼视力不得低于20/20。视力可矫正至20/20，三栖特战队备选者须接受射屈光角膜切除术（photorefractive keratectomy，PRK）或雷射层状角膜切除术（laser-assisted in situ keratomileusis，LASIK）以矫正视力。以上是进入BUD/s的必备条件，不过身为一个受期待的受训者，必须远远超出上述的条件，以下是较具竞争性的项目：
“Loyalty to Country, Team and Teammate Serve with Honor and Integrity On and Off the Battlefield, Ready to Lead, Ready to Follow, Never Quit, Take responsibility for your actions and the actions of your teammates, Excel as Warriors through Discipline and Innovation, Train for War, Fight to Win, Defeat our Nation's Enemies, Earn your Trident everyday.”
“In times of war or uncertainty there is a special breed of warrior ready to answer our Nation's call. A common man with uncommon desire to succeed. Forged by adversity, he stands alongside America's finest special operations forces to serve his country, the American people, and protect their way of life. I am that man.”
“My Trident is a symbol of honor and heritage. Bestowed upon me by the heroes that have gone before, it embodies the trust of those I have sworn to protect. By wearing the Trident I accept the responsibility of my chosen profession and way of life. It is a privilege that I must earn every day.”
“My loyalty to Country and Team is beyond reproach. I humbly serve as a guardian to my fellow Americans always ready to defend those who are unable to defend themselves. I do not advertise the nature of my work, nor seek recognition for my actions. I voluntarily accept the inherent hazards of my profession, placing the welfare and security of others before my own.”
“I serve with honor on and off the battlefield. The ability to control my emotions and my actions, regardless of circumstance, sets me apart from other men. Uncompromising integrity is my standard. My character and honor are steadfast. My word is my bond.”
“We expect to lead and be led. In the absence of orders I will take charge, lead my teammates and accomplish the mission. I lead by example in all situations.”
“I will never quit. I persevere and thrive on adversity. My Nation expects me to be physically harder and mentally stronger than my enemies. If knocked down, I will get back up, every time. I will draw on every remaining ounce of strength to protect my teammates and to accomplish our mission. I am never out of the fight.”
“We demand discipline. We expect innovation. The lives of my teammates and the success of our mission depend on me - my technical skill, tactical proficiency, and attention to detail. My training is never complete.”
“We train for war and fight to win. I stand ready to bring the full spectrum of combat power to bear in order to achieve my mission and the goals established by my country. The execution of my duties will be swift and violent when required yet guided by the very principles that I serve to defend.”
“Brave men have fought and died building the proud tradition and feared reputation that I am bound to uphold. In the worst of conditions, the legacy of my teammates steadies my resolve and silently guides my every deed. I will not fail.“
2012年7月，位于美国维吉尼亚海滩，专门给予三栖特战队使用的市训练靶场被曝光使用伊斯兰女性头像作为靶标，美国伊斯兰关係委员会(Council on American–Islamic Relations)提出抗议，并且要求五角大楼撤除这类标靶。在抗议后几小时，美国海军宣布下令撤除这类型引发争议的标靶图像。
读书笔记摘抄新闻资讯
进行水中训练三栖特战队
三栖特战队示範逮捕俘虏
三栖特战队于树林中进行任务