Heart of Spring is the debut collection of poetry by Australian author Shaw Neilson, published by The Bookfellow Publishers in Sydney, New South Wales, in 1919.
The collection contains 57 poems from a variety of sources, with a preface by A. G. Stephens. It was also issued as 25 copy limited and numbered edition in 1919.
A reviewer in The Bulletin described the book as being "full of delicate charm." They continued: "His is not the strong, clear note of a master singer; his themes are often of the slightest and his craftsmanship enables him to miss the commonplace by a very narrow margin; but the work will please the literary reader, while, by a certain gentle force which it possesses, it may reach many to whom much modern poetry is a thing strange and incomprehensible."
The Queenslander noted that the "great merit of the poems...lies in their exquisite refinement, their impeccable simplicity, and rapid flow of rich lyric laughter."