Half a Lifelong Romance (半生緣) is a Chinese novel by Eileen Chang.

It was initially serialized in a Shanghai newspaper Yi Bao (亦報) in 1948, under the title Eighteen Springs (十八春).

In 1966, Chang edited the book in the United States and republished it under the title Half a Lifelong Romance in Taiwan.

The novel was under the heavy influence of John P. Marquand's work, H. M. Pulham Esq.

Chang transplanted and adapted the synopsis, character settings, important scenes, and dialogues from Marquand's work.