Delphi's Reserved Words

Below you find a list of Delphi's and Lazarus's reserved words and some "dangerous" words that you should avoid as identifiers in your programs.

Reserved words cannot be redefined or used as identifiers, such as: begin, function, if, procedure,... In addition to these, other words (such as at, on,...) act like reserved words.

As an example, the following declarations are illegal:

const Function = 1; // FUNCTION is a reserved word!
var Begin: integer; // BEGIN is a reserved word!

Also directives (such as absolute, default,...) have special meanings in the Delphi language. Although it isn't strictly forbidden to use them for identifiers, in a lot of cases this gives errors. Therefore we included them also in our list.

Finally we included some words that are not really forbidden, but that can lead to very difficult to debug errors. We advise you to also avoid them as identifiers in your code. These words are marked with a star (*) such as: application, integer, real,...
For more on "dangerous" words, see words to avoid.

A
 absolute *
 abstract *
 add
 and
 AnsiChar *
 AnsiString *
 Application *
 array
 as
 asm
 assembler *
 at
 automated *
B
 begin
 Boolean *
 break
 Byte *
 ByteBool *
C
 Cardinal *
 case
 catch
 cdecl *
 Char *
 class
 Comp *
 const
 constructor
 contains *
 continue
 Currency *

D
 debugger
 decimal *
 default *
 delete
 deprecated *
 destructor
 dispid *
 dispinterface
 div
 do
 Double *
 downto
 dynamic *
E
 else
 end
 enum *
 except
 Exception *
 export *
 exports
 extends
 Extended *
 external *
F
 false 
 far *
 file
 final
 finalization
 finally
 Float *
 for
 forward *
 function
G
 get *
 goto

I
 if
 implementation
 implements *
 import
 in
 index *
 inherited
 initialization
 inline *
 instanceof
 Int *
 Int64 *
 Integer *
 interface
 internal *
 is
L 
 label
 library *
 Long *
 LongInt *
 local *
 LongBool *
 LongWord *
M
 message *
 mod
N
 name *
 near *
 new
 nil 
 null
 nodefault *
 not
O 
 of
 on
 or
 out
 overload
 override *

P
 package *
 packed
 PAnsiChar *
 pascal *
 PByteArray *
 PChar *
 PCurrency *
 PDouble *
 PExtended *
 PInteger *
 platform *
 POleVariant *
 private *
 procedure
 program
 property
 protected *
 PSingle *
 PShortString *
 PString *
 PTextBuff *
 public *
 published *
 PVariant *
 PVarRec *
 PWideChar *
 PWideString *
 PWordArray *

R
 raise
 read *
 readonly *
 Real *
 Real48 *
 record
 register *
 reintroduce *
 remove
 repeat
 requires *
 resident *
 resourcestring
S
 safecall *
 sbyte *
 Self *
 set
 shl
 Short *
 ShortInt *
 ShortString *
 shr
 Single *
 SmallInt *
 static
 stdcall *
 stored *
 strict private
 strict protected 
 string
 super
 switch

T
 then
 this 
 threadvar
 throw 
 to
 true * 
 try 
 type
 typeof
U
 uint *
 uint64
 ulong * 
 unit 
 unsafe 
 until 
 uses
 ushort * 
V
 var 
 varargs *
 Variant *
 virtual *
 void *
W
 while
 WideChar *
 WideString *
 with 
 Word *
 WordBool * 
 write *
 writeonly *
 xor

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Delphi (and Lazarus) Reserved Words