Synonyms of observer

observer

noun

əb-ˈzər-vər 

as in spectator

someone who sees or watches something

observers of the boxing match seemed to be divided as to who won

Synonyms & Similar Words

• spectator
• viewer
• witness
• onlooker
• bystander
• watcher
• eyewitness
• spy
• voyeur
• peeper

Example Sentences

Recent Examples of observer

But observers and investors tell me that there’s little that Personalis — or Merck, which owns 13% of the company — can do to change the terms. — Rohan Goswami, semafor.com, 20 Aug. 2026

Bessent’s maneuvers are distinct, some observers say, by not being prompted by crisis or particularly disorderly market conditions. — Christopher Anstey, Fortune, 20 Aug. 2026

The observer themselves is interfering with the experiment or the outcome of the experiment, and that is such an interesting role. — Quanta Magazine, 20 Aug. 2026

This feeling can cause educators and other observers to lose sight of how the school itself can be part of the solution. — Jerome A. Graham, The Conversation, 19 Aug. 2026