The SECR P class is a class of 0-6-0T steam locomotive designed by Harry Wainwright.

They were inspired by, and loosely based on, the more successful LB&SCR A1 class "Terriers" and 8 were built in 1909 and 1910. They were originally intended for lightweight passenger trains, to replace underpowered steam railmotors. Certain cost-saving design compromises had been made, compared to the Terrier design, and the P class were found to be underpowered, having only 73% of the Terrier's tractive effort.

The P class were later re-allocated to shunting and station pilot duties.

All eight locomotives passed into Southern Railway ownership at The Grouping in 1923, and into British Railways ownership at Nationalisation in 1948. Withdrawals took place between 1955 and 1961, but four examples have been preserved.