• Male or female participants who are at least 18 years of age on the day of signing informed consent with histologically confirmed diagnosis of metastatic uveal melanoma will be enrolled in this study. Prior hepatic directed therapy for metastatic uveal melanoma is permitted.

• Male participants: A male participant must agree to use a contraception as detailed in Appendix 3 of this protocol during the treatment period and for at least 200 days after the last dose of study treatment and refrain from donating sperm during this period.

• Female participants: A female participant is eligible to participate if she is not pregnant (see Appendix 3), not breastfeeding, and at least one of the following conditions applies: (a) Not a woman of childbearing potential (WOCBP) as defined in Appendix 3, OR (b) A WOCBP who agrees to follow the contraceptive guidance in Appendix 3 during the treatment period and for at least 120 days after the last dose of study treatment.

• The participant (or legally acceptable representative if applicable) provides written informed consent for the trial.

• Have measurable disease based on RECIST 1.1.49 Lesions situated in a previously irradiated area are considered measurable if progression has been demonstrated in such lesions.

• Have an Eastern Cooperative Oncology Group (ECOG) performance status of 0 to 1.

• Have the ability to swallow oral medications (olaparib).

• Have adequate organ function as defined in the protocol.