#2 Paris St. Germain (France) - 23 titles
French club Paris St. Germain were one of the most successful clubs during the 2010s decade, being the only club apart from Barcelona to win 23 titles in all competitions during this period.
The Parisian club won six Ligue 1 titles during the period 2012-13 to 2018-19, which includes four in a row from 2012-13 to 2015-16, to quadruple their pre-2010 tally of French top-flight titles.
PSG won five French Ligue Cup (Coupe de La Ligue) and five French Cup titles (Coupe de France) during the 2010s decade, winning the double of both domestic Cup titles in four successive seasons from 2014-15 to 2017-18. The two-time defending Ligue 1 champions also won the French Super Cup (Trophée des Champions) seven times during the decade.
PSG find themselves in second place in this list only because they won all their 23 titles during the 2010s in domestic competitions.
#1 Barcelona (Spain) - 23 titles
With 23 titles in all competitions during the 2010s decade, no club other than Barcelona (and PSG) won as much during this period.
Barcelona lifted the UEFA Champions League in 2010-11 and 2014-15, both times as part of a 'treble' of league, league Cup and European Cup. The Catalan club won seven Liga titles in this decade, which includes four in the last five seasons.
The record 30-time Copa del Rey winners won five domestic Cup titles during the 2010s, as well as five Super Coppa Espana titles.
In European club football competition other than the Champions League, Barcelona won two UEFA Super Cup and two FIFA Club World Cup titles - each coming in the year of their Champions League success.