The name Unding has been used for three tropical cyclones in the Philippines by PAGASA in the Western Pacific.
Unding was retired by PAGASA after the 1977 typhoon season and replaced with Unsing for the 1981 season. It was, however, later reintroduced in the early 2000s.
Unding was re-retired by PAGASA following the 2004 typhoon season and replaced with Ulysses in the 2008 season.
The 1977 Pacific typhoon season was one of the least active Pacific typhoon seasons on record, with only 19 tropical storms forming. It was also the second of three known typhoon seasons during the satellite era to not produce a Category 5-equivalent super typhoon, sandwiched between the 1974 and 2017 seasons. The season's first storm, Severe Tropical Storm Patsy, formed on March 23 and the last, Typhoon Mary, dissipated on January 2, 1978. With Mary spanning two calendar years, it became the fourth typhoon to do so since 1945. Since then, two other typhoons have achieved this feat.