|Date of birth||26 June 1986|
|Place of birth||Rome, Italy|
|Height||1.77 m (5 ft 9 1⁄2 in)|
|2005–2006||U.S. Tor di Quinto|
|* Senior club appearances and goals counted for the domestic league only and correct as of 31 May 2015.
† Appearances (Goals).
Napoleoni became the first ever Italian player to play in the Polish Orange Ekstraklasa (former named Idea Ekstraklasa), joining him after was Joseph Dayo Oshadogan his teammate at Widzew Łódź. He moved to Levadiakos after Widzew Łódź were relegated at the end of 2008.
In January 2009 he signed for Greek club Levadiakos, because APOEL FC has withdrawn its interest for the player. He became an idol for the fans of Levadiakos throughout the years. On July 2012, six months before his contract with Levadiakos expired, Napoleoni is attracting interest from West Bromwich Albion,as the Baggies are keen. He left Levadiakos in December, 2012, when his contract expired. Waiting and dreaming of becoming a star in Italy, Stefano Napoleoni is content to be in Greece. Where the crisis 'there, even if you feel less than they say the news'. In January 2013, it was a step away from Robur Siena S.S.D., only to return to Athens and choose the Atromitos. As reported by La Gazzetta dello Sport , is Roman, Stephen, was born in New Salary and exploded in the Tor di Quinto, which began touring Europe in 2006: first the Poles of Widzew Lodz, among the Greeks of Levadiakos. On overall, Napoleoni played 98 games (27 goals, 11 assists} with the club.
On January 2013 he signed for Greek club Atromitos F.C. Napoleoni, after each goal celebrated by showing the Colosseum that has tattooed on his right finch[clarification needed]. It was discovered in Italy by Zbigniew Boniek who took him to Poland and from there started his pilgrimage which then went through a lot of Greece. Napoleoni besides has not hidden that is a A.S. Roma fan : " I dream playing in A.S. Roma with the phenomenon Francesco Totti. I was in the field against PAOK, I scored two goals and we won. In the locker room my teammates told me the result of Roma - Lazio and for me it was a total massacre. If Rudi García call me, I could go to Rome on foot. "
On April 2015, the contract of the Italian striker with Atromitos F.C. is running out and according to Metrosport newspaper PAOK are considering to make a move. Napoleoni enjoys a decent season with Atromitos F.C. having netted ten goals since the start of the season. AEK and U.S. Sassuolo Calcio have already expressed their interest, but now PAOK have been added into Napoleoni's suitors. However, it is believed that PAOK have not made any official approach yet and if it happens it will be after the hiring of a new technical director at the club. 
On 3 May 2015 Atromitos played against Panionios a very important game for entering in the play-offs. Eventually Napoleoni scored his 2nd hat-trick and Atromitos beat Panionios by a final score of 3-1,dragging his club to the Greek play-offs.  Being one of the most stable and most valuable players of Atromitos F.C. during the last seasons, and in any case, the 28 year old cashed his offer with a new four-year contract (2 + 2 years) which will tie him with the club till 2019. 
- Profile (Polish)
- "West Brom eyeing Levadiakos winger Stefano Napoleoni". tribalfootball.com.
- "Napoleoni si candida: 'Roma, prendi me'". calciomercato.com.
- "Roma, Napoleoni: "Alla Roma andrei a piedi!"". calcionews24.com. 6 September 2013.
- "PAOK eye Napoleoni deal". sdna.gr. 10 April 2015.
- "Κρίνεται του Ναπολεόνι". paokmania.gr. 23 April 2015.
- "Έτσι θα τα χώνει στα πλέι οφ με Ναπολεόνι!". www.sports.gr. 3 May 2015.
- "Ατρομητος-Πανιώνιος 3-1". www.sport-fm.gr. 3 May 2015.
- "Ανανέωσε ο Ναπολεόνι με τον Ατρόμητο". www.gazzetta.gr. 16 May 2015.
- "Ανανέωσε με Ναπολεόνι". www.football-land.gr. 16 May 2015.
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