The Doeberl Cup is the longest running weekend chess event in Australia. Since 1963 it has been held every year in Canberra, Australia. Grandmaster Ian Rogers holds the record for the most number of wins (either outright or on tie-break) with 12.

The Doeberl Cup was named after its primary sponsor, Erich Doeberl. The family tradition of sponsoring the tournament continues today with Rosemarie Doeberl providing support for her father's vision. In 2007 O2C Solutions was the major sponsor of the tournament and from 2008 has attained the rights to run the tournament. In 2020, operation of the event was transferred to the ACT Chess Association, with O2C retaining naming rights.

This years event has over 350 players playing in 5 sections. The top section is a norm event with 6 GM's in the 61 player field.

2026 O2C Doeberl Cup