Sigfrido Fontanelli

{{Short description|Italian cyclist (1947–2004)}}

{{use dmy dates|date=May 2017}}

{{Infobox cyclist

| name = Sigfrido Fontanelli

| image = Finish van de 2e etappe in Maastricht 1e Julien Stevens, 2e Wil in het Veld, Bestanddeelnr 922-5882.jpg

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| birth_date = {{birth date|1947|10|1|df=yes}}

| birth_place = Montelupo Fiorentino, Italy

| death_date = {{death date and age|2004|2|20|1947|10|1|df=yes}}

| death_place = Lastra a Signa, Italy

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| role = Rider

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| show-medals = yes

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Sigfrido Fontanelli (1 October 1947 – 20 February 2004){{cite web|url=http://www.museociclismo.it/content/ciclisti/ciclista/7267-/index.html |title=Sigfrido Fontanelli |work=museociclismo |accessdate=28 March 2019}} was an Italian racing cyclist.{{cite web |url=http://www.cyclingarchives.com/coureurfiche.php?coureurid=20216 |title=Sigfrido Fontanelli |accessdate=16 May 2017 |work=Cycling Archives}} He won stage 12 of the 1976 Giro d'Italia.{{cite web |url=http://www.cyclingarchives.com/ritfiche.php?ritid=138833 |title=Giro d'Italia 1976 |accessdate=16 May 2017 |work=Cycling Archives}}