"MC's Act Like They Don't Know" is a hardcore hip hop song written and performed by American rapper KRS-One.

It was released on August 28, 1995 via Jive Records as the lead single from his second solo studio album KRS One.

Recording sessions took place at D&D Studios in New York.

Its lyrics deal with how many rappers who achieve positive chart positions and other commercial awards cannot perform well live.

It also made it to number 84 on the UK singles chart and number 12 on the UK Official Dance Singles Chart.