Several groups protested outside of the student center during and before the appearance by Richard Spencer, who leads a white nationalist organization. Some silently held placards while others loudly chanted slogans.
During the speech, Spencer spoke about the white race being the 'winners'.
"America, at the end of the day, belongs to white men," Spencer said.
Meanwhile, hundreds gathered at nearby Kyle Field to hear music and speeches highlighting diversity and unity as a counter to Spencer.
A&M officials say the university didn't schedule the speech by Spencer, who was invited to speak by a former student who reserved campus space available to the public. It was scheduled by Preston Wiginton, briefly an A&M student who has gone on to become a white nationalism activist. Wiginton has said he paid the university $3,500 for security at the Spencer event.
On mobile? Vote in our poll by clicking this line.
The Associated Press contributed to this report.