Shortland Street's 20th anniversary is a series of episodes that aired to commemorate the 20th year of the New Zealand soap opera Shortland Street from 21 to 25 May 2012. The episodes were built around a 90-minute episode that aired on the 21st and climaxed in a helicopter crash. Billed as Shortland Street's biggest ever episode, the anniversary was highly praised by reviewers and received record ratings. Other storylines included Gerald Tippett's heart surgery and Callum McKay's departure.

Yvonne Jeffries is a fictional character on the New Zealand soap opera Shortland Street. She was portrayed by Alison Quigan in a guest stint in 2004, before returning in a regular role the following year. She remained on the show until 2011 and returned as part of the shows 20th anniversary in May 2012.