0th

0th or zeroth may refer to:

Mathematics, science and technology

 * 0th or zeroth, an ordinal for the number 0
 * 0th dimension, a topological space
 * 0th element, of a data structure in computer science
 * 0th law of Thermodynamics
 * Zeroth (software), deep learning software for mobile devices

Other uses

 * 0th grade, another name for kindergarten
 * January 0 or January 0th, an alternate name for December 31
 * 0 Avenue, a road in British Columbia straddling the Canada-US border