- Sep 1 Cetshwayo ascends to the throne as king of the Zulu nation following the death of his father Mpande.
- Sep 6 Regular Cable Car service begins on Clay Street, San Francisco
- Sep 15 Last German troops leave France
- Sep 16 German troops leave France
- Sep 17 19 students attend opening class at Ohio State University
- Sep 18 Government bond agent Jay Cooke & Co collapses, causing panic on Wall St, the start of the panic of 1873 and the Long depression
- Sep 20 Panic sweeps NY Stock Exchange (railroad bond default/bank failure) NY shut banks for 10 days due to a bank scandal
- Sep 23 Tom Allen beats Mike McCale for Heavyweight Boxing title
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