English: Hello!
French: Bonjour!
Kittyish: Meow!

C:
#include <stdio.h>
int main(int argc, char *argv[])
{
	printf("Hello!");
	return 0;
}

C++:
#include <iostream>
using namespace std;
int main(int argc, char *argv[])
{
	cout << "Hello!" << endl;
	return 0;
}

PHP:
<?php
	echo 'Hello!';
?>

Python:
def main():
	print 'Hello!'

if __name__ == '__main__':
	main()

sh/bash (nearly the same thing):
echo Hello!

Batch file:
@ECHO Hello!

Visual Basic:
Private Sub Form_Load()
	MsgBox "Hello!"
End Sub

QBasic:
PRINT "Hello!"

TI-83 and TI-84 BASIC:
Disp "HELLO!"

Assembly (Intel style - there's also an AT&T style which I don't completely understand):
mov byte [0xB8000], 'H'
mov byte [0xB8001], 0x07
mov byte [0xB8002], 'e'
mov byte [0xB8003], 0x07
mov byte [0xB8004], 'l'
mov byte [0xB8005], 0x07
mov byte [0xB8006], 'l'
mov byte [0xB8007], 0x07
mov byte [0xB8008], 'o'
mov byte [0xB8009], 0x07
mov byte [0xB800A], '!'
mov byte [0xB800B], 0x07

HTML:
<html>
<head>
	<title>Useless page to demonstrate HTML</title>
</head>
<body>
	Hello!
</body>
</html>

XML:
<?xml version="1.0" ?>
<!DOCTYPE asdf SYSTEM "asdf.dtd">
<asdf>
	Hello!
</asdf>

D:
void main()
{
	writefln("Hello!");
}

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2 human languages, 1 animal language, 13 programming languages, total 16 languages.