Adalberto Siebens

{{short description|Puerto Rican boxer}}

{{Use dmy dates|date=December 2018}}

{{Infobox sportsperson

| name = Adalberto Siebens

| full_name =

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| nationality = Puerto Rican

| sport = Boxing

| birth_date = {{birth date and age|1946|10|20|df=yes}}

| birth_place = Guayanilla, Puerto Rico

| death_date =

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}}

Adalberto Siebens (born 20 October 1946) is a Puerto Rican boxer. He competed in the men's light welterweight event at the 1968 Summer Olympics.{{cite Sports-Reference |url=https://www.sports-reference.com/olympics/athletes/si/adalberto-siebens-1.html |archive-url=https://web.archive.org/web/20200418120809/https://www.sports-reference.com/olympics/athletes/si/adalberto-siebens-1.html |url-status=dead |archive-date=18 April 2020 |title=Adalberto Siebens Olympic Results |accessdate=10 December 2018}} At the 1968 Summer Olympics, he lost to Habib Galhia of Tunisia.