• 1998 in rugby union by country (7 C)
• 1998 rugby union tournaments for national teams (2 C, 9 P)

/

• Rugby clubs established in 1998 (19 P)

A

• 1998 in African rugby union (1 C, 2 P)
• 1998 in Asian rugby union (1 C, 3 P)

C

• 1998 rugby union tournaments for clubs (4 C, 5 P)

E

• 1997–98 in European rugby union (5 C, 7 P)
• 1998–99 in European rugby union (5 C, 8 P)

N

• 1998 in North American rugby union (2 C, 1 P)

O

• 1998 in Oceanian rugby union (1 C, 2 P)

R

• 1998 rugby sevens competitions (1 P)

S

• 1998 in South American rugby union (1 C, 2 P)

T

• 1998 rugby union tours (11 P)

W

• 1998 in women's rugby union (3 C, 1 P)