Staffordshire Police is looking for any information from people who may have seen the incident on May 18 on Railway View in Hednesford.
Police said the alleged incident saw the woman, believed to be in her 40s, get into a verbal altercation with three youths, then be punched in the face and stomach by one of the group.
The woman was said to not require hospital treatment and left the area on foot.
The force has put out the appeal for anyone who witnessed the alleged incident to get in touch with them as soon as possible.
A spokesman for Staffordshire Police said: "Officers are appealing for information after a woman was allegedly assaulted by a group of three youths in Cannock.
"At approximately 2.25pm on 18 May, it is believed that a woman, in her 40s, was involved in a verbal altercation with a group of three youths on Railway View in Hednesford.
"It is alleged that one member of the group punched the woman in her face and stomach.
"She did not require hospital treatment and left the area on foot.
"Police would like to speak to anyone who may have witnessed the incident or those who may have any information which can assist officers with the investigation.
"Contact us on 101, Facebook or Twitter, quoting incident 384 of 19 May. Alternatively, contact Crimestoppers anonymously on 0800 555 111."