The best‑known answer is that Mrs Brown is played by Irish comedian and actor Brendan O’Carroll , who portrays Agnes Brown (often called “Mrs Brown”) in the TV sitcom Mrs. Brown’s Boys and related shows.

Quick Scoop: Who plays Mrs Brown?

Because “Mrs Brown” can refer to a few different characters, here are the main possibilities people usually mean:

  • In Mrs. Brown’s Boys (TV, stage, and specials), Mrs Brown (Agnes Brown) is played by Brendan O’Carroll.
  • In the Paddington films, Mrs Brown (Mary Brown, Paddington’s adoptive human “mum”) is played by Sally Hawkins.
  • In the 1997 film Mrs Brown (about Queen Victoria and John Brown), the title refers to Queen Victoria; she is played by Judi Dench, while John Brown is played by Billy Connolly.

If you’re asking the classic “Who plays Mrs Brown?” in a TV‑comedy / forum / trending context, people almost always mean Brendan O’Carroll in Mrs. Brown’s Boys.

If you tell me whether you mean the sitcom, the Paddington movies, or the 1997 drama, I can zoom in with a bit more detail on that specific Mrs Brown.

TL;DR:
Most likely: Brendan O’Carroll plays Mrs Brown (Agnes Brown) in Mrs. Brown’s Boys ; Sally Hawkins plays Mrs Brown in Paddington ; Judi Dench plays Queen Victoria in the film Mrs Brown.

Information gathered from public forums or data available on the internet and portrayed here.