"We therefore commit his body to the deep, to be turned into corruption, looking for the resurrection of the body (when the Sea shall give up her dead), and the life of the world to come, through our Lord Jesus Christ; who at his coming shall change our vile body, that it may be like his glorious body, according to the mighty working whereby he is able to subdue all things to himself."
— Traditional Anglican Burial at Sea Service
A burial at sea is a form of funeral where the body of the deceased is disposed of at sea. May involve burning the ashes and then scattering them to the wind, or just dumping a weighted coffin off the side of a boat. Often an exception to It Always Rains at Funerals, though you may get some high waves anyway.
These were very common in Real Life back when sea voyages were long. If it's two weeks before the next port, you do not want to lug the body around. They still occur on occasion but nowadays its most commonly a last request in the will of an old sailor.
In science fiction, the equivalent to burial at sea... IN SPACE! has its own trope, Burial in Space. A Viking Funeral is a subtrope with an Incendiary Exponent.
Not to be confused with the two part Downloadable Content for Bioshock Infinite.
As a Death Trope, all Spoilers will be unmarked ahead. Beware.
In the Pokémon anime, Ash and co. tried to do this with Team Rocket when they found them floating on the sea after escaping from a sunken ship. It turned out they were just unconscious, and Pikachu was disappointed.
In Hokuto No Ken 2, Captain Akashachi's body is put on a boat, which is then put to drift in the sea.
Although not actually at sea, in Batman Returns a bunch of penguins push The Penguin's body into the river.
In The Enemy Below, 'Heinie' Schwaffer dies of his injuries, and is buried at sea in the final act of the film.
In The Godfather, Luca Brasi was buried at sea after being killed in a restaurant. This was confirmed when Sonny was told, "Luca Brasi sleeps with the fishes." Most likely he was dumped either the Hudson or East River.
Happens in Flight of the Intruder after one of the protagonists is killed during the first mission of the film.
In The Crow: City of Angels, Ashe Corven was dumped into the local harbor following his murder by Judah and his gang. As this is a Crow movie, he got better.
Frankie (Lenny's deceased older brother) from Shark Tale is actually given this type of funeral after being crushed to death by a falling anchor (which prompts Oscar to think that he killed Frankie, and not the anchor), where his body is tossed overboard the deck of the shipwrecked RMS Titanic (the sharks' lair) and floats to the surface belly-up.
In an Alastair ReynoldsRevelation Space story, an epic Stern Chase is underway between two vessels that routinely approach the speed of light. The second in command of the pursuing vessel is dying, and requests that her body be fired forward the next time the ship is at top speed. She jokes, grimly, that it's an old pirate custom: Burial at Cee. She even points out that the joke only makes sense in a language that hasn't been spoken in Millennia.
In The Sopranos, after Tony Soprano and his gang kill Salvatore "Big Pussy" Bonpensiero (who they believe has betrayed them), they wrap up his body and, with heavy hearts, give it a decent burial at sea.
In The X-Files, Scully's father, a Navy captain, is cremated and buried this way while Bobby Darin's "Somewhere Beyond the Sea" (his and Maggie's wedding song) plays in the background. Scully is upset, saying that her father was entitled to a full burial at Arlington, while her mother replies that he would have wanted it this way.
In "The Even Chance", a man from Hornblower's division dies after a cannonball tore off his leg. Hornblower's concern for him (and for his men during the funeral) marks the point where his men start to respect him.
In "The Examination for Lieutenant", Finch who previously saved Hornblower's life dies and has a funeral. They also sell his stuff in order to gain money to support his widow.
At the beginning of "Retribution", quite a few men who died during a battle with Spaniards are prepared to be buried at sea, and boatswain Matthews is shown to be particularly caring about giving them a decent send-off.
In MythQuest, Seth floats Osiris' body down the Nile to get rid of it and prevent Isis from resurrecting him.
JAG: At the end of "Need to Know", the families of the crew of a submarine that foundered off the Soviet coast in 1968, on a secret mission, gets to see a declassified film of the burial at sea that took place shortly after recovery of the wreckage.
Was the norm for deceased sailors, both merchant and military, until relatively recently on practical grounds; storing a body for more than a couple of days without creating a health hazard for the rest of the crew requires refrigerated space that most ships cannot spare -what they do have is needed for storing food- and only in the last fifty years or so has the option to offload casualties by helicopter become available. Most religious denominations have specific burial services for this situation.
According to the US government, Osama Bin Laden's body was laid to rest in this fashion after being killed by US special forces. They didn't want people propping up shrines at a burial site.
This follows a tradition established after World War 2. Most executed war criminals were cremated and their ashes were scattered over lakes, rivers, or seas, whichever was easily accessible.
There are two designated areas within UK territorial waters where this can be performed for people who die on land but wish to be buried at sea anyway, usually career sailors or especially passionate yachtsmen. This was the subject of considerable publicity after one such body was insufficiently weighted down and washed up on the Isle of Wight.
There now exists an option to have your ashes mixed into a special environmentally-safe concrete, which is then dedicated, set, and placed in the ocean to serve as an anchoring spot for corals, sponges, seaweed, etc., in hopes of rebuilding a reef. They can even do pets!
In the event of mission failure while on the first moon landing (i.e. they couldn't get the astronauts off the moon and back to Earth), Richard Nixon had a contingency set up to read the burial at sea rites to Armstrong and Aldrin.