Merrett is a surname. Notable people with the surname include:

• Charles Merrett (1863–1948), Australian merchant, agriculturist, politician
• Daniel Merrett (born 1984), Australian rules footballer with Brisbane Lions
• Henry Merrett (born 1886), Australian rules footballer
• Jackson Merrett (born 1993), Australian rules football player
• John Campbell Merrett (born 1909), Canadian architect of Montreal's Central Station
• Lara Merrett (born 1971), Australian visual artist
• Leo Merrett, Australian rules footballer for the Richmond Football Club
• Mitch Merrett, Canadian record producer
• Nigel Merrett (born 1940), ichthyologist, with British Natural History Museum
• Paul Merrett, celebrity chef in Godalming
• Roger Merrett (born 1960), Australian rules footballer in the Victorian Football League
• Thorold Merrett (born 1933), Australian rules footballer in the Victorian Football League
• Zach Merrett (born 1995), Australian rules football player

• Merrett–Murray Medal awarded annually to the player adjudged the Brisbane Lions Club Champion of the season
• Merrett R. Stierheim, public administrator in the public sector in Miami-Dade County from 1959 to 2004