I129 or I-129 may refer to:
*
Interstate 129, an auxiliary Interstate Highway which connects South Sioux City, Nebraska to Interstate 29 in Sioux City, Iowa
*
Iodine-129 (I-129 or
129I), a radioactive isotope of iodine
*
Form I-129 (Petition for a Nonimmigrant Worker) filed by employers for workers seeking a temporary nonimmigrant worker classification such as the
H-1B visa,
H-2A visa,
H-2B visa, or
L-1 visa
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