Betty Disero is a Canadian politician, the former Lord Mayor of Niagara-on-the-Lake, Ontario. She is a former city councillor in Toronto, Ontario, Canada. She was elected to the Toronto City Council in 1985, and served until her resignation in 2003. She moved to Niagara-on-the-Lake in 2009 and was first elected to town council in 2014, becoming Lord Mayor in 2018.

Disero's parents were Italian immigrants who moved to Toronto from the town of Pescara. She took courses at York University, and graduated in computer studies from Humber College in 1979.

Disero is a member of the Liberal Party, and worked as a campaign manager for Member of Provincial Parliament Tony Ruprecht prior to running for office herself. She was elected in 1982 as a trustee on the Toronto Catholic District School Board.

In 1985, Disero defeated veteran politician Joseph Piccininni to win election to the Toronto City Council. Her campaign was assisted by members of the provincial and federal Liberal parties, including Tony Ruprecht and Member of Parliament Charles Caccia. She was generally associated with the council's right-wing.

Disero was appointed to several important city commissions following her election. She was appointed to the Board of Directors of St. Michael's Hospital in January 1986 as a city representative, and was appointed to the city's three-member budget review group later in the same year. Disero was subsequently appointed to the Toronto Harbour Commission in 1987. She sought the chairmanship of the city-services commission in late 1987, but was defeated.

In March 1988, Disero brought forward a controversial six-month freeze on new rooming houses for the city. Disero argued that she was not opposed to rooming houses as such, but was trying to combat abuses in the system. She also argued that she was trying to prevent neighbourhoods from being turned into ghettos. Critics argued that the freeze was an unwarranted overreaction, and made it even more difficult for the city's homeless to find affordable housing. Toronto Mayor Art Eggleton described it as "a completely unjustified panic move". Following criticism from the provincial government, council partially overturned the freeze in May 1988. Disero later supported separate efforts to address abuses within the system.

Disero was re-elected without opposition in 1988. In 1990, she opposed plans by the Supportive Housing Group to build affordable housing on McCormack Street. She argued that the proposed project was "too large and incompatible with the neighborhood".

She initially voted for a declaration of Toronto Gay Pride Day in 1989, but later indicated that she did so only on procedural grounds, to reopen debate at a subsequent meeting. She voted against the declaration when the issue was reconsidered. In later years, she took steps to improve her relationship with Toronto's gay community.