Beaumaris is part of the Division of Goldstein in the Australian Federal Parliament, an electoral seat created in 1984 following the abolition of the Division of Balaclava. Named after early feminist parliamentary candidate Vida Goldstein, the division encompasses Beaumaris and surrounding bayside suburbs, including Bentleigh, Brighton, Sandringham, and parts of Cheltenham and Gardenvale. The 2025 federal election was closely contested, with Independent Zoe Daniel conceding to former Liberal incumbent Tim Wilson, who won 50.08% of the two-candidate-preferred vote against Daniel’s 49.92%, reflecting a swing of +1.88% to the Liberals. Overall, Wilson received 43.42% of the primary vote, while Labor’s Nildhara Gadani captured 13.67% and the Greens 7.19%.

At the state level, Beaumaris lies within the Electoral district of Sandringham for the Victorian Legislative Assembly. The district includes Black Rock, Sandringham, and parts of Cheltenham, Hampton, Highett, and Mentone. Historically a Liberal stronghold since its creation in 1955—apart from a brief Labor tenure from 1982 to 1985—the seat is currently held by Brad Rowswell of the Liberal Party. In the 2022 Victorian state election, Rowswell secured 55.2% of the two-party-preferred vote, maintaining a swing of +4.8% to the Liberals.

Locally, Beaumaris falls under the governance of the City of Bayside, divided into the Ebden (west and north) and Beckett (south and east) wards following the 2008 redistribution. The current councillors, elected in 2024, are Cr Debbie Taylor-Haynes for Beckett Ward—who also serves as Deputy Mayor of Bayside for 2024–25—and Cr Geoff Leigh for Ebden Ward. Both councillors have a history with the Liberal Party; Taylor-Haynes was a candidate for Bentleigh in the 2022 state election, while Leigh served as a Liberal member of the Victorian Legislative Assembly for Malvern (1982–1992) and Mordialloc (1992–2002).

Overall, Beaumaris reflects a consistent pattern of conservative-leaning political representation across federal, state, and local levels, while federal elections can occasionally produce closely contested outcomes highlighting active community engagement.