Katharine, Lady Cook CMG OBE (née Timpson; 1863 – 17 May 1938) was a British medical missionary who worked in Uganda.

[9] The Cooks also authored a manual of midwifery in Ganda, the local language, Amagezi Agokuzalisa, published by Sheldon Press, London.

[11] Cook defended some students against these claims of insubordination, including one of their "brightest", who she said had not had the opportunity to tell her side of the story and whose reprimand had not been justified.

[11] However, Cook was suspicious of her students and treated them like "morally suspect, impractical girls", censoring their mail and was explicitly concerned that they might form romantic attachments that might potentially end their careers.

[8] Historian Carol Summers has suggested that this patronising and negative view was in part the result of the Cook's confusing yaws with syphilis and thus thinking that there was an STD epidemic of huge proportions.

In 1918, Cook was awarded the MBE, the Belgian Red Cross and the Queen Elisabeth Medal for nursing services during World War I.