After analyzed the OFC, AFC, CAF, CONCACAF and CONMEBOL.
Let's now analyze UEFA.

Baltic League

The Triobet Baltic League, also known as the Baltic League, was a football club tournament for men in the Baltic region. It featured the top clubs from Estonia, Latvia, and Lithuania, and was held four times. The tournament was introduced in 2007, taking inspiration from the Baltic Basketball League and the now-defunct Royal League, a Scandinavian tournament.

This competition had a total of 4 editions.

In this competition, we did not have any club that stood out as the biggest winner. However, we can see that Latvia was the country that won this competition the most.

UEFA Intertoto Cup

The UEFA Intertoto Cup, also known as the UI Cup in German-speaking countries and originally named the International Football Cup, was a summer football competition that involved European clubs. It was terminated after the 2008 tournament, and teams that would have entered the Intertoto Cup now qualify directly for the UEFA Europa League.

The tournament was established in 1961-62, but it was not until 1995 that UEFA took over its management. Initially, the tournament ended with a single winner, who received the Intertoto Cup. From 1967 onwards, it concluded with several group winners, ranging from 7 to 14 winners, who were awarded cash prizes. When UEFA assumed control of the tournament, it became a qualifier for the UEFA Cup, with 2 to 11 Intertoto winners advancing to the second qualifying round.

To enter the tournament, clubs had to apply, and the highest-ranking clubs in their respective domestic leagues at the end of the season were given priority. Clubs did not have to be ranked directly below those who had qualified for other UEFA competitions, and if the club in that position declined to participate, the spot would be given to the club that had applied.

The cup marketed itself as providing an opportunity for clubs that would not typically have the chance to participate in the UEFA Cup and for sports lotteries to continue during the summer. This reflected its origins as a tournament primarily for football pools. In 1995, the tournament received official UEFA approval, and qualification places for the UEFA Cup were granted. Initially, two spots were offered, but this was increased to three after one year. In 2006, the number of spots was increased to the final total of 11.

We have 4 clubs that won 2 times the competition: Hamburger SV from Germany, Villarreal from Spain, VfB Stuttgart from Germany and Schalke 04 from Germany.

Cup Winners Cup

The UEFA Cup Winners' Cup was an annual European football club competition in which domestic cup competition winners competed. It was the second seasonal inter-European club competition organised by UEFA, and it was contested for 39 seasons, with the final edition taking place in 1998-99 before being discontinued.

The inaugural tournament was held in 1960-61, but it was organised by the Mitropa Cup's Organising Committee and was not officially recognised by the governing body of European football until 1963, when the Italian Football Federation (FIGC) initiated its acceptance as a UEFA competition.

Starting in 1972, the winner of the tournament advanced to play against the winner of the European Cup (later the UEFA Champions League) in the European Super Cup.

Since the discontinuation of the UEFA Cup Winners' Cup, the place previously reserved for the Cup Winners' Cup winner in the UEFA Super Cup has been taken by the winner of the UEFA Cup, now known as the UEFA Europa League.

The competition was initially known as the European Cup Winners' Cup, but it was renamed the UEFA Cup Winners' Cup in 1994.

Undoubtedly, Barcelona is the biggest winner of this competition with 4 titles. Apart from them, only AC Milan, Chelsea, Anderlecht, and Dynamo Kyiv were able to win this competition twice.

Mitropa Cup

The Mitropa Cup, which was also known as La Coupe de l'Europe Centrale or Central European Cup, was one of the earliest major European football club cups. It was played among the countries that emerged from the former Austria-Hungary. In 1951, a replacement tournament called the Zentropa Cup was held, but it only lasted for one season. The Mitropa Cup name was subsequently restored, and in 1958, the tournament was renamed the Danube Cup, but only for one season. The competition was ultimately terminated in 1992.

The most successful club in this competition is Hungary's Vasas SC, with 6 titles won, and the second most successful club is Bologna, with 3 titles.

Scandinavian Royal League

The Royal League was a yearly football tournament held three times among teams from the three Scandinavian monarchies (Denmark, Sweden, and Norway) after the conclusion of the regular domestic seasons of Norway and Sweden. However, Denmark was in the midst of their season when the tournament started. The tournament included the four best-placed teams from the football leagues of Denmark, Norway, and Sweden.

There were discussions about expanding the league to include the winners of Veikkausliiga and Landsbankadeild, which are the Finnish and Icelandic premier divisions.

The 2007-08 edition of the tournament was cancelled due to financial reasons.

FC Kobenhavn from Sweden won the title 2 times.

Europa Conference League

The UEFA Europa Conference League, also known as UECL, is a yearly club football competition that is organised by the Union of European Football Associations (UEFA) for eligible European football clubs. Teams earn qualification to participate in the competition based on their performance in their respective national leagues and cup competitions.

This tournament is considered the third tier of active European club football competitions, after the Champions League and the Europa League.

Currently, only AS Roma won the title.

Europa League

The UEFA Europa League, previously known as the UEFA Cup, is a yearly football club competition organised by the Union of European Football Associations (UEFA) since 1971 for qualified European football clubs. It is the second-tier of European club football, ranking below the UEFA Champions League and above the UEFA Europa Conference League. From 1971 to 1999, the UEFA Cup was the third-tier competition before the UEFA Cup Winners' Cup was discontinued and it was elevated to second-tier. Clubs are eligible for the competition based on their performance in their national leagues and cup competitions.

It was introduced as the UEFA Cup in 1971, replacing the Inter-Cities Fairs Cup, and then merged with the UEFA Cup Winners' Cup in 1999. A group stage was added from the 2004-05 season before the knockout phase. The competition was rebranded as the Europa League from the 2009-10 season, merging with the UEFA Intertoto Cup, and expanding the format to an expanded group stage with revised qualifying criteria. The winner of the UEFA Europa League qualifies for the UEFA Super Cup and, since the 2014-15 season, enters the following season's UEFA Champions League at the group stage.

The club with the most titles in this competition is Sevilla from Spain with 6 titles won. In second place, we have 4 clubs tied with 3 titles won: Atlético Madrid from Spain, Juventus from Italy, Liverpool from England, and Inter from Italy.

European Super Cup

The UEFA Super Cup is the third most important football competition in Europe, held annually between the winning teams of the two most important club competitions in Europe: the UEFA Champions League and the UEFA Europa League.

The competition takes place at the beginning of the national seasons in August and has the official status of opening the European season for clubs, even with national leagues and other tournaments already underway.

Formerly, it was contested between the winners of the UEFA Champions League and the winners of the Cup Winners' Cup, which was discontinued in 1999 and replaced by the UEFA Cup (now the UEFA Europa League).

This competition had its inaugural edition in 1973. However, in 1972, Centenary Rangers FC, a celebration of Rangers' centenary, brought together Ajax, the European Cup champions, and Rangers, the Cup Winners' Cup winners of 1971-72. This commemorative game is considered by many to be the first edition of the Super Cup, as it featured the two European winners of the same season. As Rangers were serving a one-year ban imposed by UEFA for the misbehavior of their fans, the entity did not recognize that edition.

Starting from the 2013 edition, UEFA determined that the match would be played in pre-determined venues.

Real Madrid, AC Milan and Barcelona are the biggest winners of this competition with 5 titles each. Liverpool is in second place with 4 titles won.

Champions League

The Union of European Football Associations (UEFA) organizes the UEFA Champions League (UCL), an annual club football competition featuring top-division European clubs. The competition format includes a round robin group stage, a double-legged knockout format, and a single leg final to determine the winners. It is considered one of the most prestigious football tournaments in the world and the most prestigious club competition in European football, and it is played by national league champions and runners-up of their national associations.

Originally introduced in 1955 as the Coupe des Clubs Champions Européens, commonly known as the European Cup, the competition was initially a straight knockout tournament open only to the champions of Europe's domestic leagues. The current name was adopted in 1992, and a round-robin group stage was added in 1991, allowing multiple entrants from certain countries since the 1997-98 season. While most of Europe's national leagues can still only enter their champion, the strongest leagues now provide up to four teams. Clubs that do not qualify for the Champions League are eligible for the second-tier UEFA Europa League competition and, since 2021, for the third-tier UEFA Europa Conference League.

In its current format, the Champions League begins in late June with a preliminary round, three qualifying rounds, and a play-off round, all played over two legs. The group stage includes 32 teams, drawn into eight groups of four teams, and they play each other in a double round-robin system. The eight group winners and eight runners-up proceed to the knockout phase, culminating in the final match in late May or early June. The winner of the Champions League qualifies for the following year's Champions League, the UEFA Super Cup, and the FIFA Club World Cup.

Clearly, Real Madrid is the king of the Champions League having won the title 14 times. In second place, we have AC Milan who won the title 7 times, and in third place, we have Bayern Munich and Liverpool who won the title 6 times.

Total Titles (Clubs and Countries)

Clubs

Real Madrid is the biggest winner in European competitions, having won 21 titles out of 323 existing competitions.

In second place, we have AC Milan with a total of 15 titles won, and in third place, we have Barcelona with 14 titles won.

Countries

To the surprise of many due to the eternal phrase that the Premier League is the best football league in Europe, Spain is the country where its clubs have won the most titles, having conquered 66 official titles.

In second place is Italy with 55 titles won by Italian clubs, and in third place, we finally have England with 46 titles won by English clubs.