The honor, which was announced in a statement Monday, falls on a day that commemorates the two jersey numbers that Bryant wore during his Lakers career: 8 and 24.
Bryant, who won five championships among numerous other accolades, also will be honored for philanthropy work.
"Among his astonishing list of accomplishments, Kobe Bryant's 20-year career with the Los Angeles Lakers ranks him No. 1 all-time for NBA players who played for a single franchise, and 'Kobe Bryant Day' is the City of Los Angeles' way of thanking him for his single-minded dedication to excellence, the fans and the entire City and region of Los Angeles," L.A. City Councilman Jos? Huizar said in a statement.
"For 20 years, we were all the beneficiaries of Kobe's incredible talent and legendary work ethic, and on 8-24 we'll gather to say, 'Thank you, Mamba.'"
Bryant will be honored at Los Angeles City Hall.