103 is the natural number following 102 and preceding 104.

List of numbers — Integers << 100 101 102 103 104 105 106 107 108 109 >>
Cardinal	one hundred [and] three
Ordinal	103rd (one hundred [and] third)
Factorization	<math>prime<math>
Roman numeral	CIII
Binary	1100111
Hexadecimal	67

One hundred three is the 27th prime number. The previous prime is 101, making them both twin primes.

One hundred three is also:

• The atomic number of lawrencium, an actinide.
• The flight number of Pan Am Flight 103, which crashed over Lockerbie, Scottland and was at one time called "the air-disaster of the century".
• The year AD 103 or 103 BC.

ja:103 sl:103 (število) sv:103 (tal)