Glenlynn is a rural locality of the Shire of Bridgetown–Greenbushes in the South West region of Western Australia. The locality is located along the South Western Highway, which passes through it north to south.

The Shire of Bridgetown–Greenbushes is located on the traditional land of the Bibulman (also spelled Bibbulmun or Pibelmen) and Wardandi (also spelled Wadandi) people, both of the Noongar nation.

In the south-west of the locality of Glenlynn, some talc mining was carried out between 1942 and 1951, with 514 tonnes of talc produced.

Glenlynn was a siding on the Picton to Northcliffe railway opened in 1911, originally named Lights, renamed to Nairnup in 1911 and renamed again, now to Glenlynn, in 1913, until closed in 1967.