The 2024 Lisboa Belém Open was a professional tennis tournament played on outdoor clay courts.

It was the eighth and fourth editions (for men and women, respectively) of the tournament, which was part of the 2024 ATP Challenger Tour and the 2024 ITF Women's World Tennis Tour.

It took place in Lisbon, Portugal, between 23 and 29 September 2024.

[1] The following players received wildcards into the singles main draw: The following player received entry into the singles main draw as a special exempt: The following player received entry into the singles main draw as an alternate: The following players received entry from the qualifying draw: The following players received entry as lucky losers: The following players received wildcards into the singles main draw: The following players received entry into the singles main draw using a special ranking: The following players received entry from the qualifying draw: The following players received entry as a lucky loser: