Implementation
C++

Be concise.

Be useful.

All contributions dictatorially edited by webmasters to match personal tastes.

Please do not paste any copyright violating resource.

Please try to avoid dependencies to third-party libraries and frameworks.

Other implementations
System.out.println("Hello World");
from __future__ import print_function
print("Hello World")
echo "Hello World" . PHP_EOL;
import "fmt" 
fmt.Println("Hello World")
document.write("Hello World!");
#include <stdio.h>
printf("Hello World\n");
System.Console.WriteLine("Hello World!");
puts "Hello World"
println!("Hello World");
with Ada.Text_IO;
use Ada.Text_IO;
Put_Line ("Hello World!");
print_endline "Hello World!"
(println "Hello World")
import std.stdio;
writeln("Hello world!");
print("Hello World");
io:format("~s~n", ["Hello, world!"])
print *, 'Hello, world!'
(princ "Hello, world!")
WriteLn('Hello, world!');
print "Hello, world!";
println("Hello, World!")
(display "Hello World")
#import <stdio.h>
NSLog(@"Hello world\n");
System.Console.WriteLine("Hello World!")
write('Hello, world!\n')
print("Hello World")
putStrLn "Hello world!"
IO.puts "Hello World"
print("Hello World")
pragma(msg, "Hello World");
console.log('Hello World');
format("Hello world~n")
"Hello World" |> IO.puts
IDENTIFICATION DIVISION.
PROGRAM-ID. hello.
PROCEDURE DIVISION.
DISPLAY "Hello World!".
STOP RUN.
use 5.010;
say 'Hello World';
(print "Hello World")
(format T "Hello World")
fun main() {
    println("Hello world!")
}
<?='Hello World'?>
<?php echo 'Hello World'; ?>
console.log('Hello World')