Janet and John is a series of early reading books for children, originally published in the UK by James Nisbet and Co in four volumes in 1949–50, and one of the first to make use of the "look and say" approach.

[2] These had a new Anglicised text by Rona Munro, wife of John Mackenzie Wood who ran Nesbit and Co; she was originally a teacher from New Zealand.

[3] The first volumes of the 1949–50 Janet and John series were simply called Books One to Four[1] and presented, using limited vocabulary, incidents from the daily life of a brother and sister.

[2] Working with Philippa Murray, Rona Munro created an updated series for Nisbet and Co called Kathy and Mark.

Having purchased the rights to Janet and John from Nisbet and Co, Star Kids Ltd published an updated series of 33 volumes in 2001 covering reading, writing and mathematics for children aged four to seven.

[16] While the names Janet and John were retained, the text and illustrations were updated to include characters from different ethnic backgrounds and from non-nuclear families.