Brett Johnson may refer to:

• Brett Johnson (Australian footballer) (born 1981), Australian rules footballer
• Brett Johnson (cricketer) (born 1994), New Zealand cricketer
• Brett Johnson (footballer, born 1985), English footballer
• Brett Johnson (rugby union) (born 1994), Canadian rugby union player
• Brett Johnson (writer), American television writer
• Brett Johnson, former cybercriminal and co-founder of the website ShadowCrew

• Brett Johnston