On 26 February 2014, he scored twice in Real Madrid's 6–1 win against Schalke 04 in the Champions League round of 16 first leg. He then scored one of the team's three goals in a 3–0 quarter-final win over Borussia Dortmund on 2 April, taking him to five Champions League goals for the season. In La Liga, he scored four goals in three matches between gameweeks 31 and 33, as Real Madrid defeated Rayo Vallecano (5–0), Real Sociedad (4–0) and Almería (4–0).
On 16 April, Bale scored the winning goal for Real Madrid with five minutes remaining in the 2014 Copa del Rey Final against rivals Barcelona. Considered one of the best goals of his career, Bale outsprinted Barcelona defender Marc Bartra from the halfway line (with Bale running off the field at one point) before converting past goalkeeper José Manuel Pinto. In the post match interview Bale stated, "I had to get round the player and go off the pitch to do it", while his Real Madrid teammate Xabi Alonso commented, "It was incredible, I have never seen anything like it". The goal was Bale's 20th of the season and his first in a Clásico fixture.
On 24 May, Bale scored in the 110th minute of the extra time period to put Real Madrid 2–1 up against city rivals Atlético Madrid in the 2014 UEFA Champions League Final, as Los Blancos won their tenth European Cup. The goal made Bale the first Welshman to score a goal in a European Cup/Champions League final. Bale finished his debut season with 22 goals and 16 assists in all competitions. Real Madrid's attacking trio of Bale, Benzema and Cristiano, dubbed the BBC, finished the season with 97 goals.
Bale started the 2014–15 season in good form, playing the full 90 minutes and assisting Cristiano Ronaldo's first goal in a 2–0 win at the Cardiff City Stadium against Sevilla to win the 2014 UEFA Super Cup. After the match, his performance was described as "amazing" by Ronaldo. Six days later, Bale scored his first goal of the season in a 4–2 away loss to Real Sociedad. Bale scored twice in Real's 8–2 win over Deportivo La Coruña on 20 September 2014.
In December 2014, Bale scored in a third major final, the second goal in a 2–0 win over San Lorenzo, to help the club win the FIFA Club World Cup. In a match against Espanyol on 10 January 2015, Bale was booed by a section of Madrid fans who adjudged him as being selfish in shooting for goal and not passing to Ronaldo. Bale was defended by Carlo Ancelotti over this plus difficulties at the end of the season. On 18 April, Bale sustained a calf injury against Málaga.
On 9 September 2014, Bale scored two goals, one with a header and another with a free kick, as Wales beat Andorra 2–1 in their first match of the UEFA Euro 2016 qualifying campaign. In doing so, he became Wales' joint 10th all-time top-scorer with 14 goals, alongside John Hartson. Bale scored two goals on 28 March 2015, in a 3–0 win away in Israel. On 12 June, his 50th cap, he scored the only goal to defeat Belgium in a home qualifier, taking Wales above the Belgians to the top of Group B. He headed Jazz Richards' cross on 3 September in a 1–0 away win over Cyprus, putting Wales three points away from qualification. With qualification to UEFA Euro 2016 achieved (the country's first major finals since the 1958 FIFA World Cup), on 13 October 2015, Bale scored his seventh goal of the qualifying campaign in Wales' final qualifier against Andorra at the Cardiff City Stadium.
Bale has endorsed several companies in his career and has current deals with Adidas, EA Sports, Lucozade and BT Sport. In March 2014, Bale was the first player to wear the Adidas F50 crazylight football boots. In 2015, he unveiled the Adidas X15 football boots.
In November 2014, Bale appeared in FIFA's "11 against Ebola" campaign with a selection of top football players from around the world, including Cristiano Ronaldo, Neymar, Xavi and African star Didier Drogba. Under the slogan "Together, we can beat Ebola", FIFA's campaign was done in conjunction with the Confederation of African Football and health experts, with the players holding up eleven messages to raise awareness of the disease and ways to combat it. In October 2020, he gave £15,000 for Christmas hampers in Swansea, Wales.