Voted for by the clubs supporters, the duo join the list on Chelsea's official website.
World Cup winner Leboeuf helped Chelsea towards two FA Cup wins, including the last at the old Wembley, a League Cup and UEFA Cup during his five-year spell at Stamford Bridge.
Webb's most notable contribution for the Blues was scoring the winning goal against Leeds United in the 1970 FA Cup final replay at Old Trafford.
Webb, who made over 230 league appearances for the Blues between 1968 and 1974, even came back to the Bridge to manage the club for a brief spell in 1993, saving the club from relegation from the top flight.
The defensive pair join a long list of players inducted into the Hall of Fame including Gianfranco Zola, Bobby Tambling and Ron Harris.
* Supporters can continue to vote for players to be included in the legends section, on the club's official website.