Hendrik Pieter Koekkoek (13 January 1843, Hilversum - year unknown, England) was a Dutch landscape painter. He signed his paintings "H. P. Koekkoek", but is usually referred to as Pieter Hendrik. His year of death is known to have been after 1890. Some sources indicate it was before 1910, but a few place it as late as 1927.
He was a member of the famous ; son of the landscape painter, Marinus Adrianus Koekkoek. His three uncles and paternal grandfather were all painters.
His father gave him his first art lessons. At the beginning, in the 1860s and 1870s, he painted in the same style as his father; Realism with Romantic elements. His subject matter was mostly forests and rivers. Later, his works were entirely Realistic. He had a reputation for a love of nature that went beyond mere professional interest.
He worked throughout the Netherlands; alternating his base between Amsterdam and The Hague. He also made long, frequent trips to London, where his cousin, Hermanus (known as "The Younger"), owned an art dealership. Much of his work was sold in England. The last verified reference to him is in the Amsterdam City Register for June, 1889. There is some indication that he gave lessons to, who was born in 1883.