Thomas Ludwig John D'Alesandro III (July 24, 1929 – October 20, 2019) was an American attorney and politician who served as the 44th mayor of Baltimore from 1967 to 1971.

[2] He was the eldest son of Thomas D'Alesandro Jr., the 41st mayor of Baltimore;[1] and brother of Nancy Pelosi, the 52nd speaker of the United States House of Representatives, and first woman to hold that office.

[1] As City Council president, he worked with Mayor Theodore McKeldin, a liberal Republican, to eliminate racial barriers in employment, education and other areas.

[6] He devised summer recreation programs for the city's youth, such as mobile pools and day camps, and also laid legislative groundwork for the Inner Harbor development.

[10][11] Just four months after D'Alesandro's inauguration, the Baltimore riot of 1968 erupted after the assassination of Martin Luther King Jr., and Maryland Governor Spiro Agnew called National Guard troops in to control the situation.

[13][14] As mayor, he appointed multiple African-Americans to his administration, some of them, such as George Russell Jr., the city solicitor and member of the Board of Estimates, the first African Americans to hold those positions.

Much of what other mayors get credit for began in those tumultuous four years, from urban design and labor law reform to streamlined governmental administration and the flowering of the vital alliance between the city and the Greater Baltimore Committee".