Waalwijk

Foundation and amateur era (1940–1984)

RKC was founded on 26 August 1940 under the name Rooms Katholieke Combinatie (RKC), following the merger of three Roman Catholic football clubs from Waalwijk: Hercules Excelsior Combinatie (HEC), Waalwijkse Voetbalvereniging Besoijen (WVB), and Waalwijkse Voetbalvereniging Hercules. The merger was encouraged by local Catholic organisers who sought to unite the town's footballing resources into a single, stronger club. A decisive factor came in 1940 when the Roman Catholic Football Federation was absorbed into the Royal Dutch Football Association (KNVB), which would have required the three clubs to compete at a lower level than expected. The prospect accelerated negotiations, and the merger was completed that summer.

The newly formed club began league play in the Derde Klasse and adopted the yellow-and-blue colours that remain associated with RKC. Its home ground was Sportpark Olympia, which served as the club's base for several decades. From its inception, the club functioned as a central sporting institution within Waalwijk's Catholic community and experienced steady organisational growth in the post-war years.

When professional football was introduced in the Netherlands in 1954, RKC remained an amateur club and did not enter the professional league system. Over the following decades, however, the club gradually established itself among the country's strongest amateur sides, progressing through the upper levels of Dutch amateur football and regularly competing in the Hoofdklasse. Contemporary accounts suggest that the club benefited from strong local support and organisational backing during this period, which contributed to its competitive rise.

RKC's amateur era reached its peak in the early 1980s. The club won back-to-back national amateur championships, defeating DOS Kampen in the 1981 final and retaining the title in 1982 with victory over IJsselmeervogels. These successes marked the culmination of more than four decades of development at amateur level and paved the way for the club's transition into professional football in the mid-1980s.

Professional football in the Eerste Divisie (1984–1988)

As a result of those achievements, RKC entered professional football in the 1984–85 Eerste Divisie. Under chairman Harder, technical board member Kipping, and head coach Leen Looijen, the club assembled a squad combining leading amateur players—including Leon Hutten and Janus van Gelder—with experienced free transfers such as Anton Joore, Leo van Veen, Adrie Bogers, John Lammers, Peter Bosz and Ad van de Wiel. The only transfer fee paid was for Marcel Brands, who arrived from FC Den Bosch.

RKC's first professional match ended in a home draw against Willem II, with Van de Wiel scoring the club's first goal at professional level. In their debut season, RKC finished fifth in the Eerste Divisie, qualifying for the promotion play-offs. The club maintained its upward trajectory in the following two campaigns, finishing third and fourth respectively, again reaching the play-offs.

In the 1987–88 season, with key players including Van de Wiel, Bosz and Brands, RKC won the Eerste Divisie title and secured promotion to the Eredivisie.

Two decades in the top tier (1988–2007)

RKC were promoted to the Eredivisie in 1988. Shortly afterwards, Marcel Brands, Peter Bosz and head coach Leo van Veen left the club. Ger Blok was appointed as head coach, with André Hoekstra and Herman Teeuwen among the reinforcements, but a difficult first half of the club's debut top-flight season led to Blok's dismissal. Van Veen returned and guided RKC to 11th place in 1988–89, securing survival.

The club improved over the next two seasons. In the 1989–90 season RKC made a strong start and briefly topped the table in the opening weeks before finishing eighth. Around the same period, the club also appeared in the Intertoto Cup in 1989, finishing third in its group, recording two wins against FC Carl Zeiss Jena. Ahead of the 1990–91 season, Marco Boogers was signed and Brands returned to Waalwijk, and RKC finished seventh, which at the time represented the club's highest league position since entering professional football.

In 1991, the club became involved in a fiscal investigation by the Dutch FIOD, which uncovered an illegal payments scheme. Van Veen and board member Piet Kipping were sanctioned for their roles, and the club subsequently reorganised its financial and administrative structure. Despite the disruption, RKC remained competitive on the pitch, finishing tenth in the 1991–92 season; they also returned to the Intertoto Cup in 1992, recording a home victory over Caen.

The consequences of the FIOD investigation affected the playing staff, and the club was granted a licence for the 1992–93 season only after selling a significant portion of the squad. On the field, RKC struggled: under Hans Verèl the team collected six points before the winter break and he was replaced by Bert Jacobs. During the second half of the season, Giovanni van Bronckhorst joined on loan from Feyenoord. RKC avoided automatic relegation and retained their Eredivisie status through the promotion/relegation play-offs.

The mid-to-late 1990s were characterised by repeated relegation battles. The club again required play-offs to remain in the division on several occasions, including the aforementioned 1993–1994 season and in successive seasons between 1997 and 1999. Ahead of the 1995–96 season, "Waalwijk" was added to the club's official name, and the following season, the club moved into its new home ground, the Mandemakers Stadion, a 7,500-seat stadium opened with the season's opening match against Roda JC.

From the late 1990s onwards, RKC stabilised and increasingly established itself as a mid-table Eredivisie side. Martin Jol was appointed head coach in 1998 and oversaw a sustained period of consolidation. The club finished seventh in the 2000–01 season, matching its earlier best league position and qualifying for the Intertoto Cup. RKC were eliminated in the opening round by 1860 München, having also exited at the same stage the previous year against Bradford City.