Giovanni Battista Lacchini (20 May 1884 – 6 January 1967) was an Italian astronomer.

[1] He is primarily noted for his work in the study of variable stars.

He published over 100 works, including papers in "Astronomische Nachrichten" and "Memorie della Società astronomica italiana".

[2] The Giovanni Battista Lacchini Award is named for him.

The Lunar crater Lacchini on the far-side of the Moon and the Mars-crossing asteroid 145962 Lacchini were also named in his honor.