38
38 may refer to:
38 (number), the natural number following 37 and preceding 39
38 BC
AD 38
1938
2038

Science 
 Strontium, an alkaline earth metal in the periodic table
 38 Leda, an asteroid in the asteroid belt

Other uses 
.38, a caliber of firearms and cartridges
.38 Special, a revolver cartridge
Thirty-Eight: The Hurricane That Transformed New England, a 2016 book by Stephen Long
"Thirty Eight", a song by Karma to Burn from the album Almost Heathen, 2001